Zak died two years before the miniseries events began.
No, that is not the significance of Laura’s scenes. That is certainly relevant, yes. But the importance of her scenes was to show that, unlike the rest of the characters, her life had improved since everyone else lost everything. She had lost her entire world before the Colonies fell, but in the fleet she found purpose, passion, and love. She’s even accepted her inevitable death now.
She’s reached the place the rest of the characters need to get to. And like all the other flashback scenes, it was important for them to show how far these characters had come.
Kara used to be a functional person. How long has it been since we’ve seen that Kara, if ever?
Lee was happy back then… and then got stuck in the fleet living the life he didn’t want. It had been a while since we’d seen that Lee, too – last time we saw him, Dee blew her brains all over Gaeta’s locker right after.
I think the pidgeon was symbolizing Lee chasing something he couldn’t quite catch… but, eh. That sort of allegory always falls flat anyway, for me.
Baltar, of course, we learned nothing new about. Caprica, however, turns out to have been more nuanced from the beginning than we had known of.
The whole point of this entire series is NOT the mystery of what is going on, or the uncertainty of human-Cylon relations – it is how all of that crap affects these characters we’ve come to know over the years. Here, at the end, they needed to go back and show just how much they’ve all changed. And, of course, they’re preparing us for saying goodbye to these mostly annoying people.
But, since they never revisited Bill Adama’s unwanted meeting, I’m rather sure we’ll be seeing Caprica That Was again in the rest of the episode next week.