As a slight debate with the OP, the only thing I disagree with is Munoz losing to Weidman didn't hurt his stock. It wasn't a close decision... he got laid out... and I just can't see that being a rematch anyone cares to see. I think Weidman going on to capture the title is the worst thing that could have happened to Mark.
I also think Munoz is the classic gatekeeper. He'll never contend with the top 5 on a regular basis, but can serve as a good measuring stick in the meantime.