God, I hope people won't overcomplicate the whole performance level thing, that could turn the whole draft into an annoying nightmare. It is of some relevance, but most great players performed consistently well during their peaks no matter who the manager was.
For example, I wouldn't pick van der Sar as the goalkeeper if I picked Ancelotti as the manager, because his spell at Juve sucked, no two ways about it. Such obvious examples should count, but I really hope we won't go into extreme nitpicking.