Should almost never invest to a young strikers, as they are not fully developed. Striker as a position is something, where most of the people will peak near the 30s at. It takes certain type of understanding about the game, that comes in time. The movement, timing, game sense etc. are essential for becoming a great striker and little boy like Moise, can only dream about the qualities mentioned above.
I wouldn't even call them growing pains, he just doesn't have it.