Werdum has a couple of interesting fights in Bellator, I guess. Werdum vs Bader, Minakov, Fedor. However, Werdum would make big money in Japan, I think. NYE events against other legends and he would be making bank. Werdum vs Kharitonov, Hunt, Fedor, Barnett, etc (most rematches btw and he wins all of them too).
His big money fight would be the rematch vs Fedor, though. If you know anything about Coker, you know he will be salivating over the possibility of Fedor fighting a legit legend in Bellator.