Well clearly if you can pick from any division, its gonna be a heavyweight, I'd say Wlad Vitali or maybe even Haye who is a tremendous athlete, P4P perhaps someone like Margarito, Maidana that type of guy who really relys on there strength rather than skill...
**** how did I forget p4p its Victor Ortiz that guy is hella strong, example in the ring, the way he man handled and beat up an already very strong Andre Berto...
Very briefly, few rounds into it Vitali was pushing him around whenever he wanted. And Brewster got pushed around by Wlad, im pretty confident Vitali could do the same. Stocky does not always mean strongest.
There's a big difference between lifting strength and functional strength. Despite the numbers Mosley is alleged to have been throwing around, he was handled and pushed around by Winky Wright. Wright was obviously naturally bigger, but I doubt his gym lifts are greater than Mosley's.