I can understand the frustration from a number of Championship Managers who say the January window is a nightmare.
Like you have said PL teams want their players to get game time and not sit on the bench.
Perfect example was that of Carvalho who would have been a great signing for us but we couldn`t guarantee game time.
I`m sure we signed Spence with a view to him playing on a regular basis.
So we must be able to guarantee a new RB coming in to the team will play more often than not.
Whilst Gray has been great he is not imo a RB and depending on the severity of his injury we are relying on Byram and Shackleton who also have an injury waiting to happen.