The words "My motivation is to prove everyone that they are wrong and I am not done. I will prove that, or I will die trying" are exactly the same he said about 3 years ago. The only difference was that he said he would win the UFC belt or he will die trying.
I seriously hope he does not return to UFC because honestly he does not have the chin anymore to be there. Even guys like Brendan Schaub, Nelson or Mir, that are much worse in the striking than Mirko, knock him out!
ONE FC would be the best option. I agree that both Arlovksy and Sylvia would be good opponents that IMO he would actually beat.
Fedor is retired and anyway he would easily beat Crocop.
Glad to see that he is preparing for K-1 GP, I do not think he would win against the Top fighters but it will be interesting.
He looked very good in his last fight (althought it was against some unknown guy) and there is a recent video of him training, and he looks in great shape.