He does have tiny pupils like shockwave said. I'm no expert in this area but he must be on some
hard drugs to lose this much weight.
He was always crazy. Some guys may remember from the Musclemayhem days when he got pissed off with Cutler's boyfriend Madmax over something said on the forum and went over to Max's store high on something. Also kicked out of Gold's Venice etc.
Some idiots told him he could compete at 250lbs, supposedly Cormier and Charles Glass told him this. He would never have been over 180lbs even with all the steroids and gh in the world.
Arce said Cswole did 2 grams of test PER DAY for a year straight. That's crazy. 
all the pics I've seen of him, his pupils were big and black.. don't recall ever seeing them constricted.
big and black pupils (dialated) = stimulants (meth, coke, etc.. even ephedrine and yohimbine will dialate them)
constricted (tiny) pupils = pain killers (unaware of anything other than opiates that constrict pupils)
judging by his videos, I'd doubt he's a fan of opiates and would bet my last dollar that it was meth.
opiate people are different from meth/coke people.