It really wasn't that long ago that he fought Mousassi and looked faster than he's ever been.
Also in his fight with Weidman he had Chris in the ropes in the 5th. I think- at that point in time at least- he could have won that fight if he hadn't been so hesitant to pull the trigger in the early rounds. Not saying for sure he would have, but it was possible.
I also agree with Blond that he took the Romero fight too soon after the Rockhold fight.
I'm kind of on the fence about his chances of returning to his early form, somewhat from age but more from damage sustained.
I want to see how fast and strong he looks in the Hendo fight.