Sounds like he's convinced it'll be NHL or AHL. No more OHL.
There are pros/cons to this approach. On the one hand, the AHL is a completely different beast from juniors in terms of speed and physicality; if Murphy's physique right now can't endure the rigors of junior competition, chances are it probably won't in semi-pro either. However, Murphy being in Portland would enable the Yotes to oversee his development more closely, which could be beneficial to improving his durability.