Well you don't know the timeline. They could have decided he was a favorite and then thought "Hey, perfect 5th"
If I remember correctly everyone related to him died long before the war.
Except his wife and kids, who died during the attacks on the Colonies. He left them behind to get back on the shuttle that took him to safety -- his big conflict last episode.
Wow. Tonight's episode was just ... wow 
So the rez hub got nuked, 3 is back, blah blah blah. And one other thing. About 3 telling Laura she was a cylon (like in the preview) ... I can't believe the writers would play a prank like that on us ... almost believed it for a sec ...
I hate to say it, but...I didn't really like it. Something in the writing and the acting didn't click. Dilemmas that should've felt real and hard came across as contrived, tired, familiar. (Helo and Sharon face a crisis of conscience, again...and even Mary McDonnell, Roslin, couldn't make much of her lines surrounding Baltar.)
The effects were pretty, but the battle was disjointed and kind of ineffective (especially when compared to, say, Resurrection Ship Part 2.) Even the score seemed half-hearted.
I expected a lot more tension and drama surrounding the events on the rebel base star. Instead, everything went pretty smoothly right up to the attack. The Centurion attack on the humans that was foreshadowed two episodes ago, back in 'Guess What's Coming to Dinner', just didn't happen.
Lastly, Laura's visions didn't seem to do much except convince her she loved Bill, which she already seemed pretty okay with. Did we need another head-character? (That said, the most moving scene in the episode was Adama watching Roslin on the bed...oh, and it was interesting how she had a vision with every jump...)
I think part of the reason I came away so dissatisfied is that my expectations for the strike on the Hub were so high. I wanted it to be another Exodus or Resurrection Ship, but it didn't quite satisfy.