tanner would get murdered. he's needs to be able to beat silva in an aspect of the game to give him a chance. His standup isnt even close and anderson has a blackbelt in bjj which is just as good as evan tanner's grappling video lessons he originally learned from. But thats not to put tanner out because he has good enough takedowns in my opinion to take silva down eventually and good enough standup not to get knocked out in the first minute or two if he fights defensively. If tanner gets top position he can rain down those punches and elbows. His ground and pound is the one weapon he has against silva, silva may not have ever faced anyone with as good of gnp as tanner but hes fought guys who are better on the ground and survived.