The backup up players play the M2M defense vs first team offense. They can't play M2M defense vs themselves. Just not the same frequency, intensity, vs top talent.While that's not the best argument for the 2-3 zone translating to the NBA, I get your point. Something that most people forget is that SU plays against M2M defense, so we have a M2M offense, which we practice, against M2M, which requires the players to play M2M defense for most of the practice. It's a silly, tired, and old myth that Syracuse players never learn M2M and don't play M2M for 4 years once they set foot on campus, like it's illegal in Onondaga County.