Cowan is a good player, maybe not as good as he thinks he is but he's solid. So are Yager, Dickinson, and Catton.
But the problem with leaving a bunch of talent at home is they know their top of the lineup and PP spots are safe whether they're producing or not. In a short tournament such as this a role player only has so much value. Not all your skill guys are going to be on like you need them to be for every game, so when they're not there's no option to put in another producer who's been creating. You have to keep these junior kids hungry.