Or, if he seemed to need more development after his initial few months, send him out on loan somewhere in January?Agreed most other Prem clubs, if they signed him, would sensibly look towards integrating him via actually playing him.
Regarding immaturity. Mmmm.. well, okay but he's a nineteen year old lad.
At the very least that might help with his transfer value if Moyes really doesn’t want him and given he’s used 3 other players as backups rather than him in his playing position it would seem like a huge injury crisis would be needed before he’d get a second of playing time.