Choklab, The problem in Sonny, was that he was somewhat a 'clubber', and the low-profile style of Rocky Marciano would present a problem for Mr. Liston. Being 'heavily muscled' did not make it easy for Sonny to whip punches from off-balance angles. Defensively, Rocky presents a difficult target for Sonny. It looks like Sonyy's right hand would be completely nullified.