True, it is the simplest solution although I'd also give Cletus-Carnage mad OP regeneration abilities (a la Majin Buu from Dragon Ball), or maybe an...
Come to think of it, Ultron did start spreading a techno-organic virus with his code in it that could convert organic lifeforms into Ultron Sentries,...
Norman Osborn at least makes more sense, as it comes from Peter's own mythos and isn't inserting the wider MU because the producers think Spider-Man,...