I'd say yes for cruiser. Jirov was a hell of a body puncher, and with his success and the short life span of that division, I think he easily fits the bill there. Heavyweight is a different story, though.
It's a recent infatuation and the skinny bugger's planning to slide down to 175 by all accounts but if you ain't seen this bodywork... http://www.youtube.com/watch?v=Cw9R-CxEwjg
http://www.linkedin.com/pub/vassiliy-jirov/a/845/994 Apparently Jirov is now working as a Civil Engineer in Phoenix, AZ, USA. And what does a civil engineer do?