Dooku was originally a Jedi; he was, in fact, Qui-Gon’s master when Qui-Gon was a padawan. About a decade before Episode I, he indicated that he was disillusioned with the Jedi, and left the Jedi Order, returning to his homeworld, and reassuming his noble title. At some point after Maul was defeated, Palpatine/Sidious recruited Dooku to become his new apprentice.
As I understand things, there are only two Sith, but there can be any number of assholes who know how to use the Force running around the Galaxy. Maul, Asajj Ventress (Dooku’s apprentice), Savage Opress (Maul’s brother) et al running around doing shit, but there are only two official Sith. I don’t think Lucas messed anything up story-wise by creating this rule. It actually made for some pretty good story lines, with Palpatine going after other baddies simply because they were getting in his way and weren’t Sith.
Just like not all good Force users are Jedi, not all bad Force users are Sith.
ETA: As far as this episode goes, I think it’s the first time I’m actually pissed I couldn’t watch the next one right away. I’m so not used to having to deal with weekly episodes anymore, and the way this ep ended, I hate having to wait a week to get to see what happens next.
Considering how many classic and pre-established characters are being dropped into this season of the show, I am really curious which Jedi will respond to the call, and what they will do. Now that most of the other questions are being answered, this is the biggest question I will be wondering about as we near the end of the season.
It might end up being an unknown, but I doubt that. That doesn’t leave many options.
- Luke Skywalker should hear the call, but that doesn’t mean he’ll appear. All things considered, he’s an impractical character to bring back.
- Leia’s in her early stage of training, so she’s unlikely too.
- Ezra Bridger is a possible, but as his story has yet to be concluded, it would mess things up a bit to ruin that for the audience. But then again, maybe this is how his story resolves.
- Cal Kestis is from the very recent video game Fallen Order. He’s not widely known enough to be an exciting reveal for most of us, but that shouldn’t matter. We just had Cobb Vanth, and almost nobody knows him.
- Mace Windu is a long shot, as he would be 100yrs old and severely injured, even if he survived Revenge Of The Sith’s treatment of him, which canonically he probably did not.
- If we didn’t already try that avenue, I would’ve picked Ahsoka Tano. But though she might return to the story at some point, she won’t be who answers the call.
Hmm…
I agree that it’s likely to be a canonical character. I highly doubt that it’ll be Luke or Leia – Mark Hamill is available, and could theoretically have 30+ years shaved off of his appearance through CGI, but it would bring one of the franchise’s biggest names into a series that’s built around the smaller names.
Carrie Fisher is, of course, no longer with us; CGI and a stand-in were used to give “young Leia” momentary cameos in Rogue One and The Rise of Skywalker, but I don’t think it’d feel right to do so with her here.
I haven’t watched his story, but based on comments on Facebook posts about the episode this seems to be the consensus pick. The other likely option IMHO is that no one shows up and it takes a team effort of non-force users including Boba Fett 
to rescue Grogu.
Yaddle.
My guess in Quinlan Vos.
No love for fleshing out the idea that a different Dark Force user gets to Grogu first?
Well as a lesser level fan I’m hanging on to the idea that The Tragedy of the title was not so much Grogu’s capture, or Razor Crest’s destruction, but what Grogu saw and/or who he connected to when he looked into and reached out through The Force. Grogu has fear. Begun his path to the dark side has.
The saga of Anakin was handicapped in its telling by knowing the tragedy it would be. This can do that same basic story more effectively. With the pay off of a mature Darth Grogu Big Bad coming into his own as a teen for his species a few decades or so after the last trilogy ends. Then he can eat as many sentient creatures’ eggs as he wants.
I bet Palapine was a cute baby!
The Sith “rule of two” was created a thousand years before the original Star Wars by Darth Bane. Prior to that there was a literal Sith army that clashed with an army of Jedi.
This lasted for centuries until Darth Bane came along. He studied the history of ancient Sith Lords like Darth Revan and came to the conclusion that having thousands of Sith was detrimental; that it “diluted” the dark side. He came to believe that there should be as few Sith as possible — a master and an apprentice, “one to embody the power, the other to covet it.” It was understood that every apprentice would eventually attempt to kill their master and take their place, and Bane believed this would only make the Sith stronger over time.
The idea wasn’t without merit. For centuries, no matter how badly they beat the Jedi, the Jedi would always find a way to rally and eventually recover. Darth Bane’s plan (which he knew would take generations to accomplish) was to let the Jedi think the Sith had been completely destroyed, allowing them to grow complacent while the Sith worked against them from the shadows.
That being said, you don’t become a Sith by being good at following rules. The “rule of two” got cheated on a lot, as many Sith Lords had their “official” apprentice, but also had other agents they considered more disposable, whom they trained to a lesser degree. Palpatine, for example, never actually considered Maul to be his true apprentice — he was more like an assassin. Dooku, aka Darth Tyranus, was a similar situation. Palpatine needed him to control the Sepratists during the Clone Wars, but always planned to dispose of him towards the end of it. From the moment they met, Palpatine sensed Anakin Skywalker’s power, and spent years gaining his trust while subtly undermining his respect for the Jedi order. Anakin was always his chosen apprentice.
Well, it took a thousand years for Darth Bane’s strategy to pan out, but ultimately it worked. Darth Sidious, apprentice of Darth Plagueis, became Supreme Chancellor of the Republic and manipulated both sides of the Clone Wars into doing exactly what he wanted them to. In the end, the Jedi were wiped out in a matter of hours, and the Republic was finally ruled by the Sith. Palpatine managed to almost single-handedly accomplish what his order had been trying to do for millennia.
One thing that bothered me is that Boba’s armor is very clearly not Jango’s armor.
Oh, he specifically said it was, then? Huh.
Okay, Darth Yaddle.
That’s how i understood it.
It wouldn’t surprise me if Boba was a bullshitter.
Oh, no doubt, but he seemed to have proof that was good enough for Mando.
I mean, I do believe Jango was a foundling, and that Boba has ties to the Mandalorians through his father, but I could see him stretching the truth a bit in order to get his armor back from Mando. Especially if bullshitting his way through the negotiation was the only way he saw Mando relenting.
Too late to edit: Did Boba offer any sort of proof? I don’t remember how it all went down specifically. But in my memory, because Din just sort of melts when it comes to stories of Mandalorian foundlings, he gave Boba the armor based on the story of Boba’s father alone.
It occurs to me that as Ahsoka would not train Grogu because he had much fear in him, and he shows some aggressive defensive tendencies, maybe that will expose him to a Dark Side user instead of a Jedi. Possibly even a Nightsister of Dathomir.
He showed Mando his armor’s “key” or something, and Mando instantly knew his dad was a foundling and the armor was his.