I agree that player is trainable. I just think that there are many more interesting players to train that much faster could become a high quality player. And should also remember that player is 20 in two weeks and will then be two years behind new drafts that already are better than this player besides the potential that I doubt will be possible to get close to.
But yes he is trainable but I still think that other players are preferable and then for an cheaper sum as well.