I love these things!

If the final three are all Ometepe's and include Rob would the Zapatera's reward or punish him for his game?
Reward, unless he does something evil.

Will Rob continue to get a Russell edit and suffer the same TC fate?
I'm in the minority in thinking Rob didn't have an evil edit last time... it just wasn't in keeping with his god-like edit so far. So, no. Boston Rob is as far above Russell as Russell is above normal players.

If a Zap or Matt returns to the game from Redemption Island and makes it to the F3, would the Zapatera majority jury throw their votes their way?
Some will. Mike & Dave are iffy. Ralph, Julie, and Steve definitely will. Unless it's Matt, and then it'll be Steve, Julie, and Mike, not Dave and Ralph.

Will David vote objectively or emotionally?
Objectively.

If Matt gets to the F3, would his opponents argue that he never "Outwit" anyone and therefore is not deserving of the million?
Definitely. And Matt will either argue that he had to outwit people on RI, or he'll argue that it doesn't matter, he outlasted people.

What criteria would the jury use to select a winner, if Rob was not one of the F3 Ometepe to chose from?
They'll default to whoever was nicest (starting with Ashley, Matt, and Grant)

If Matt is on the jury, will he hold a grudge against his former Ometepe tribemates, and vote for a Zap instead?
No. He's not smart enough to hold a grudge. Remind me not to go to his hospital if/when he gets his medical license.

If Phillip makes it to the F3, would the jury believe that his strategy all along was to be the goat, who all would want next to them at the end?
No... and even if he didn't get cotton-mouth in explaining it, no one would reward that style of play (not even Matt).

If Rob doesn't make the F3, would he argue against those who betrayed him, or respect their play?
Depends. I think he respects gameplay... plus he's plotting to do the same thing (if this were to happen to him). But if it was Natalie spearheading it (or maybe Matt), then I don't think he'd respect them.

Which of the remaining Ometepe stand the best chance of winning, assuming that Rob is not sitting next to them at the end?
Assuming Rob isn't F3... Andrea, by virtue of "not being a spa girl" (hero), "winning an Individual Immunity" (outlast), "choosing the right alliance" (outplay), and "whacking Rob at the right moment" (outwit)