By regularly not hustling, a player contributes to an environment where giving less than 100% effort is acceptable. Other players notice, and they notice how the coaches react. So yes, to the extent that other players adopt this same mindset, because they see other guys do it and get away with it, it leads to them performing worse. This is the problem right here. The entire premise is, Soriano would be a better player if he hustled more. The comparison to Reed Johnson is not based on absolute production, but based on production relative to potential. Johnson is playing to his potential, maximizing his talents, etc. Soriano is not... or at a minimum, creates that perception by his body language and the way he plays.