Yeah their stamina is pretty high (8-9). The backups aren't that much worse though so I guess the stamina might have some effect. Well I don't know if this is a good or bad thing then lol Sometimes makes it difficult to train everyone when players are getting 80-90 minutes a week.
That would be it, then. Some time back I had two players with high stamina who I could play at the same position and whichever one I listed as the starter would play over 40 minutes. It's sad when you wish your players would lose stamina because it would be better if they were mediocre or average instead of strong or proficient.