Totally agree, he needs to be playing and need to prove he is over all his injury issues.He is approaching 20 and has had abour 4 minutes of football. He is unlikely to just get thrown into significantly more.
It is a great move for him. Southampton are well known as a showcase for young players and have been a stepping stone for many players. He should be jumping at it. Particularly if they pay big for him, they will play him.
There is no point keeping him here, it is of no use to anyone.
Brilliant move for the lad and Southampton.