I don't think Isaiah is likely to win the award. His team got beat in sectionals and didn't make state tourney. Plus, his teammate Sanjay Lumpkin is also a finalist and averages about the same ppg.
I would expect the award to go to either Drake recruit Joey King or Harvard recruit Siyani Chambers depending on what happens in the State tourney.
King could be a good one at Drake. He is averaging something like 24 pts and 6 boards in MN's biggest class.