Anderson Silva is puzzle for the UFC, he is their best fighter and also the MW division. If you aren't going to put him in a superfight may as well make him defend his title. The 185 division is a complete joke due to his reign. Chris Wideman may or may not be the right fight for him, but at 185 who is? There is simply nobody left.
The real 185 ranking imo:
4. You can either insert Okami,Weidman,Tim Boetsch, Bisping
In Okami and Boetsch both would get kill, Weidman gets his shot dude to some loophole that Bisping had to fight the real number 2/3 guys in the division to earn a shot.