if there were a world full of veteran HD coaches (a kid can dream, cant he?) and every team had very similar talent level, year after year (players randmly assigned rather than recruited), so that gameplanning was the key factor determining success (assume they are all equally good at setting practice plans and scheduling is random)...
what type of winning percentage do you think the very best gameplanners could achieve?
(in other words, is the effect of gameplanning minimal, as some suggest? or is it a vital component that can set the great apart from the merely good?)