Overeems stock shouldnt drop that much. It was his first loss in many years, and honestly Dana probably doesnt even mind. For the longest time he wanted Overeem on the roster and now that he finally came over and loses so quickly into his UFC career, Dana is probably kind of happy to be honest. Now that he has that loss out of his system (everyone loses, except if your name is Anderson Silva) he can concentrate on getting better.
I still think he would beat Bigfoot 8 out of 10 times. If he doesnt fight like a fucking amateur in the third round he wins going away. I'm prety sure he would ice almost all of the top 10 UFC heavies except Dos Santos and Velasquez.
I actually think he has a good chance of beaing Cain, as Im confident Overeem has enough stregnth and technique to stop Cains takedowns. Cain might very well be able to strike with him, but Overeem has a longer reach and a decent height advantage.
Anyway, Overeem is still a monster. He just is a fucking idiot.