I think we tend to overrate how good they are, the money being generated by the English clubs especially premership and championship level means they can attract the best players from all over the world.
So paying 1 or 2 million for say a player from motherwell is a cheap low cost option for them, so when a better more expensive player is available, some players game time is limited purely on their perceived ability, Turnbull, Hastie, Johnson etc .
In the SPL they were first pick starters, in other leagues they are squad players with limited game time only, Lennon miller for example.