But then they would have to rename his show to The Man.
(Now that I think about it, Grogu and The Man has a certain ring to it.)
Your answer is already there–the armor is his. They don’t think he deserves it, but it’s linked to him. If they deny that it’s his armor, they’re breaking their own ethics and blaspheming the beskar.
Likewise, Boba Fett isn’t a Mandalorian, but he has a right to his beskar because it was his father’s and his father’s before him. Family and lineage runs deeper than creed.
I’m more surprised they let him walk out of there with the Darksaber. Of course, Vizla (is that his name?) couldn’t win it from him. And if you can’t win it in combat, you don’t deserve it.
Phonetically correct. According to IMDB, the character is Paz Vizsla, and was apparently voiced by Jon Favreau.
Even more, if you take possession of it other than from combat, bad things will happen to you, and the Mandalorians.
I was kind of thinking that one of the things that might “fall out” would be “all the air”.
But, you know, a space wizard did it or something.
Indeed. Star Wars is not the place one should go for anything like real-world physics. 
“They” who? The giant Mandalorean who just got his ass kicked in a duel for the Darksaber or the smaller one who makes the weapons?
And so what that they told Din Djardin he’s “no longer a Mandalorean” for taking off his helmet? I’d be like “Is this a freakin vote?! I’m still the one with the Darksaber to Rule All of Mandalore,…biatch!”
Username/post checks out… 
Force fields that stop air but let everything else pass through are ubiquitous in Star Wars. See here, for instance.
I’m thinking D’jin is probably rethinking his priorities these days…showed up, lost his spear, got in a fight, AND ain’t a mando anymore.
While the tied up package definitely was intended to look like Grogu’s head, I’m pretty sure the thing inside is actually Grogu-sized Beskar chainmail. The armorer turned the spear into links for chainmail, there was one shot of them being dumped on a table, or something*.
When you think about it, Beskar chainmail is kind of a no-brainer for Jedi. Light and flexible enough they can still do their Jedi backflips and what not, but still impervious to lightsabers. Grogu might end up being the biggest Jedi badass in history.
- see the shot here
An even-smaller version of Bilbo’s mithril shirt!
Package though awfully small for something using even most of the spear’s material.
D’jin needed a falling out as a loyal subordinate of that specific group of The Way to be able to assume the mantle of leader of all the Mandalorians.
When he no longer fights against the Dark Blade, listens to it and let’s it lead, what happens?
Did Mando take Grogu’s measurements before they parted? Is he expecting Grogu to not grow at all? Because I feel like Beskar armor isn’t something one brings back to the Armorer to “take out a bit”
By its nature, chainmail is somewhat flexible in its sizing. Make it a bit over-sized and he’ll grow into it!
Well, he’s not a Child of the Watch anymore, but it seems pretty clear that he still considers himself a Mandalorian (as per his insistence when asked to surrender his weapons). Din has learned that not all Mandalorians are as conservative as the sect that raised him, and seemed pretty skeptical of the Armorer’s insistence that Bo-Katan was a failure.
just a question does the knighrs of the old republic timeline still apply? because if it does there’s no Mandalore to worry about because the republic blew up the planet 4000 years before the movies
in fact, after winning that battle the 2 generals declared themselves sith and started the sith/Jedi wars and yes they firebomb a loyal sith planet into from space just in the hopes they kill one person …
I wont mention the online games lore …
No, KOTOR is Legends now.
Also, you’re thinking of Malachor, not Mandalore. The Battle of Malachor is canon via Rebels and the Darth Maul comics, though the details are left vague and the superweapon didn’t tear the planet apart - instead, the entire population was turned to stone.