On a level playing field Kevin would rape Heath. Now, by a level playing field one could possibly say that Phil's physique was built on GH and slin and Kevin's on a ton of androgens. Thing is should a 51 year old consider doing the latter even if it was safe and even more so didn't give him a huge gut at the end of the day?
Personally I love the 3D grainy andro look over the (God forgive me) BLOOFY look any day.