There have been a few players over the years that have broken the first team then just sat out, no loans or few appearances for us. I think we have successfully stunted the growth of Field, Harper, Leko and Edwards and killed their confidence. You can make a very strong argument that all may not be/have been good enough but each of them have hit a moment where they broke in, looked great and were then dropped and then absolutely no development plan in place beyond training.
I personally think we should give Harper one more season, with only Sawyers and Livermore in CM on the books and Harper sounding motivated and more dynamic than the other two - he has to have an opportunity. He may have failed by January but we have to give these players a chance, 5, 10, 15 minute appearances at the end of games are not that chance.