If I had to replace my opponent in the final I would probably choose Steven or Tykeal, Steven because he was a loyal ally and we wouldn't get to that point if it wasn't for his help, and Tykeal because he fought really hard in challenges, and I think if it wasn't for his father it would have been an interesting final challenge.
Onto the second question, I don't like answering those sorta questions because I feel that if you make it to the final tribal council you do deserve to win. Well, if I have to mention something, it will be Gaia's behaviour during the past 3-4 days, and the final challenge in particular. I realize he wanted to win but I feel that he didn't need to get so uncontrollable and passionate because this is just a game after all. I guess the aim justifies the means though :P