I'm not saying he'll be this good, but think of it like how the Yankees went with Aaron Judge. Call-up August of 2016, played through struggles the rest of the way, and went off the next year. I think Isan can do something like that.
100% just let him finish this season out with major League club. I don't even really evaluate what he's done so far, kinda just look at them as reps. I kind of expect him to go 0-3/4 every night. Let him learn.