Are they not paying him well? If Dana and Co. want to promote Silva as the lb. for lb. best fighter, and one of the best in the UFC, then they should pay him as if he's the best fighter out there. If he's making the same money as a prime Liddell, then he has nthing to complain about/ But, it could be an issue that neither Silva nor Soares are going to come to the public with. Or, Dana can just say "If you knock your next 5 opponents out, I'll let you fight Roy Jones Jr."
His last contract was in the neighborhood of 70k+70k. On his last fight against griffin he made an additional 120k just in bonuses. Not sure what his new contract is set at, probably a lot more.