IMO Werdum's been undefeated since 2008 (got KO'd by JDS)
I believe he beat Overeem. I have no clue why Werdum was fighting scared, he was clearly winning the stand up and I believe he even outstruck him
His striking is exceptional now with the help of Cordeiro, he isn't a big slow HW that Cain can just out-quick, A-1 BJJ, good cardio, smart....
I've long thought Cain was unbeatable. If he can shake off ring rust and the 2 year layoff and run through Werdum I will have to say Cain is one of the greatest fighters ever if he isn't already