Cormier would probably be able to do pretty great at 205 if he didn't have major issues cutting weight. However he'll probably do quite well as a heavyweight as well since he, unlike Pat Barry, is not a bad fighter.
Finally saw the Strikeforce HW GP - Cormier did indeed look good and must be UFC bound. I was under the impression that was Strikeforce's last HW bout so I can't see him not entering the UFC. Not sure he'll do to well in the bigger pond though as he's even shorter than Pat Barry and'll have some beasts to contend with.