Look at the pictures though, Elliot Wright has the build of a boxer for that fight...
Heavy D is, Umm... Well he's heavy. He's not a fit guy. He frequently got out of breath walking to the diary room. He could probably throw a decent haymaker but if you actually boxed him, kept your hands up for 5 minutes and moved around the ring, he'd hit the deck without a punch
. The guy would simply tire out and collapse.