Depending on what happens in terms of transfers in, and the injury which Timmy has, I would still consider sending him on loan for 6 months.
We have Doucoure, Gana, Mangala, Timmy, and Garner who can all operate in CM. We have Harrison, Ndiaye, McNeil and Lindstrom that can all operate at CAM. Now, some of those we all think are naff and want out of the squad but I don't think that happens until the summer. If the rumours are true and we are interested in bringing in Chukwuemeka/Neil and a RW like Nuamah then that leaves us with quite a lot of options for his position.
In the summer I can see Doucoure leaving and I would be very surprised if we take up any further option for Harrison/Mangala so he'll have a better chance to get into the side and could by that point have some decent senior minutes under his belt.
If we already know he's too good for the U-18s then a decision needs to be made to get him in the senior squad and play him now and then or to let him out on loan. Don't want him to stagnate.