It wouldn't be Oscar
I love Justin's game, but his finishes didn't really warrant a Mosconi Cup Pick this year. I understand traveling is expensive and may not always be worth it to players. And.. yes, he's better than everyone on the team but Shane, but thats not the only consideration.
I think the player that really has a right to be upset (Unless he was asked and declined) was Donny Mills. He finished high in standings, is better than most of the players on the team (maybe everyone but Shane), was finishing high in tough tournaments around the selection dates, and apparently got passed over.