Thinking over the now current contenders here are my thoughts on if they won:
Owen (odds of winning: the lowest) If he wins again I think we all should refer to seasons one and two as Total Drama Owen or TDO for short and the writers sleep with Owen buttocks pillows
. He might break down and tell the others his deal with Chris but the difference between him and DJ is Owen is doing this to pay off his mother's debt so he may not. He might get caught in the act and be voted off or just a regular vote off.
Courtney (low) With Duncan and Beth's names being stated as the final two in the TDM and Harold no longer being around to fight it (the info soon had Harold and Courtney as the names as the final two to cover up their mistake) plus (as do I) most assume a girl/boy (and in this case now mostly good vs leaning towards bad) and not boy/boy (Owen vs. Duncan) or Girl vs. Girl (Beth vs. Courtney) in the finals. I believe Owen to be leaving in the next elimination episode (but the writers might pull one on us and get rid of another character to further show Owen being a mole and Courtney may be that person).
Duncan and Beth (both have the highest odds) Duncan and Beth have been written as the final two by cake in TDM and while like others have stated they seem to have the least interaction currently (that could change quickly now) they still have good odds. People have wrote that if not Duncan and Beth than Duncan and Courtney as they do have some integration (but Duncan might throw the challenge) however I like to write that I think that if it is not Duncan and Beth than maybe Beth and Courtney. They have tons of interaction currently, hate each other, share a trailer for more interaction, and seems to be on the dual scale of thinking (among other things) thus a yin and yang. They both want to see the other go down in flames. Also looking at the trailer for TDM and pictures I don't see Beth anywhere so she might win, not give up her money like Owen did in TDI, and since she won she no longer participates in the Total Drama series thus putting her character "on the bus" (thought we might get update from Lindsay her BFF on Beth's situation from time to time and maybe a cameo). Thus a "you win then you are totally out" rule. If this is true than anything the writers want Beth to do must be done withen these last few episodes of TDA.
I also have thoughts on TDM for example: who looks to be the first three out, who might start as the main antagonist (unknown if stay that way), and a possable relationship but that would probably be mentioned once a TDM thread is posted.
Like others I want to see a Aftermath. Harold and Lindsay is among my favorites plus Harold love life seems to be a issue the writes could expand upon (based on what I'm seeing as a joke the writers could do is that Geoff has video evidence that "was not shown before", edited, or from hidden cameras that suggests multiple females (and maybe a male) crushing on the oblivious Harold) I but the writers might be saving allot of that Drama for TDM and maybe a possible Total Drama Action special (like the TDI special that bridged TDI to TDA).