Looking at those pictures again, I daresay his upper body, at least, is insane in a way Kenny could only dream of. Flex's body, at least from the front, flowed together better and some of his muscles were rounder, but Brian's lats were far better, and his waist was STUPID small.
The knock against Brian is, of course, that he was an NABBA guy...these days those guys might as well be the Invisible Man insofar as getting lots of press is concerned.
That, and he never got super-hard, and his wheels weren't super-big (or so I've heard).
From what I've seen he's still better than a no. of guys who competed in the Olympia, though.