If the final three are all Ometepe's and include Rob would the Zapatera's reward or punish him for his game?

Probably. They might out of spite, punish him if he orchestrates something deviant.

Will Rob continue to get a Russell edit and suffer the same TC fate?

Right now, Rob is in control. I believe he will continue to be in control and could make the final 3. Will he lose the Jury vote? Probably not. Could he get kicked in F5, Maybe.

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?

It's a high possibility. Seeing as how most of the Zapateras liked and respected Matt from watching him on Redemption Island, they would most likely swing a vote his way especially after they now despise the Ometepe tribe. If a Zap returns and makes final 3, they will most definitely get the Zap votes, but most likely, won't get a single Ometepe vote unless Matt decides to turn on his tribe as a juror.

Will David vote objectively or emotionally?

Has David even been emotional this entire game? David will vote objectively, IMO.

If Matt gets to the F3, would his opponents argue that he never "Outwit" anyone and therefore is not deserving of the million?

Technically, he never did Outwit anyone, considering he was the 2nd and 8th voted out. Anything done on Redemption Island was him socializing with the ones voted out whom were soon eliminated by him. But he could argue the long winning streak that probably no one will ever break if they decide to do Redemption Island on another season.

What criteria would the jury use to select a winner, if Rob was not one of the F3 Ometepe to chose from?

Probably who won the most immunity challenges and/or did the most around camp both socially and physically.

If Matt is on the jury, will he hold a grudge against his former Ometepe tribemates, and vote for a Zap instead?

If he will hold a grudge, it'll be against Rob. If Rob is a juror, I don't believe Matt will hold a grudge. It's a possibility, but I don't see it happening considering he should be "forgiving" like his God would want him to be.

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?

Probably not. Phillip was mainly seen as a distraction this whole season. If anything, he was mainly kept around for the entertainment. Nothing else.

If Rob doesn't make the F3, would he argue against those who betrayed him, or respect their play?

He could respect their play. Considering that he's played this game 3 prior seasons, he could respect them waiting for their right time to strike. He would be getting played this entire season.

Which of the remaining Ometepe stand the best chance of winning, assuming that Rob is not sitting next to them at the end?

Andrea or Natalie. Both have won immunity, and both have played somewhat a strategical social game.