This is par for the course for Cain.
The truth is that his technique has always been garbage. He's been competing in a weak division and getting by on his ability to pressure fighters early into fights and exploiting their inability to cope with it. Those fighters either fold (Lesnar) or gas themselves out trying to keep pace. It's a smart strategy for a HW, but that does not equate to having a polished skillset.
I'm extremely pleased to see Cain drop the belt. Not only can the division move forward, but the championship immediately gets elevated in prestige to the level of other divisions'. Werdum's striking has come a long way in recent years and he's been an elite BJJ practitioner for his entire MMA career. For that matter, look at every fighter in the UFC's HW top five rankings. (for what they're worth) Every one of those fighters possess apparent elite skill(s). Cain has "cardio" and reinforces the divisional moniker garbageweight -- that it's just big dudes doing toughman shit, pushing each other around like stags, and throwing with wreckless abandon.
Hope we see Cain get lit up by Stipe next (decade) and he's kept far away from a title shot.
Stipe definitely has the skillset to give Cain trouble. Solid hands with a D1 wrestling base along with the grinding wrestler mentality. Something both JDS and Big Foot (lol) didn't have. But then again he got pieced up by Struve of all people.