How is Raph not the best Commander in precon?

I'm new to the game but from what I've seen online everyone says Donny or Mikey are the best to put with Leo in the precon but how is Raph not the best when from what I can see the entire precon is a +1/+1 deck? I mean I can get Heroes in a half shell but double damage on counters seems to be a home run to me