why a $20k salary player is not always better than a $15k salary player
Coach Regan is correct but it is more extreme. A $5k player in good game shape, with good balanced skills and good enthusiasm can outplay a $30k player in bad GS, with low enthusiasm and who is a momo-skilled monster.
Think of game shape (GS) as another aspect of fitness like stamina. Do you want your players to be fit and play like Dwight Howard or waddling slowly down the court like Eddy Curry?
PS: I hear Curry has lost nearly 50KG and is looking much better this season.
For the best GS play your guys about 48-70 minutes each week and have a doctor with massage specialisation.