Weidman is terribly overrated IMO. His ranking on this site seems to be based off the victory against Munoz. Munoz himself was overrated and their rankings at the time of the fight did not match up to who they had beaten.
Just looking through their UFC wins at time of fight
I'm seeing a lot of undercard guys, guys not in the UFC anymore and their biggest wins were a sloppy kickboxing match against Maia who is now at 170.
Not one guy on either of their resumes is close to Michael Bisping's talent.