Don't have a clue. The point is that many of our so called top class talents have played in the reserves instead of getting the chance to play in a top league. There is a much bigger chance that the player will get better if you play with and against better players.
Many of our top class talents the last few years would probably been much better now if they had been sold instead of playing for the reserves.
Many of them went on loan, to lower league and to overseas clubs and the majority of them did next to fuck all. Certainly not enough to suggest that selling any of them would have provoked a different result.