More than anything, I think he needs to play regular football, and build his strength and confidence. I like him, and I can see a big future for him, genuinely. I'd hate for him to be getting the occasional game or sub appearance for us, and not be developing. If that's how Koeman is going to use him, a loan to a strong Championship club or lower Prem club would be preferable.
I suppose he's a bit different to most given his time not in the professional game.
We might think he needs more "coaching" at our level, than others like Dowell who have had nothing but that from an early age.
He's had that type of real life experience so he may benefit more from being around better players every day.