The likelyhood of winning, in my eyes is:
3. Rey - Not the best, probs gets caught up having horny-buildup-sex with his TFees too much to even properly participate.

1. Prime Admin Fussel - Caesar would absolutely dominate that competition. He is a force to be reckoned with and the fact his tech can still cement his position as what he is, as well as the fact he knows how to take out the only other competitor who would have a chance against him, by softly lulling them in with words and offerings of weakness... ye, I am sure Fuss has a chance to win.

2. Riv.
   There is no doubt no one in that castle would be able to withstand Riv's curse. It might be a boring competition with her present, as everyone ends up as the same, but... ye, there will be a lot of brawny braying donkeys once she enters the ring. Do we agree? ~