Looks like he played at the WJAC last year. I believe I might've caught a US game from that tournament last year, so I could've seen him play. I might've also seen one of his USHL games last season. I don't remember, but I never claimed I have. I'll take your non-answer as an answer that you haven't seen Keane play.
I also didn't criticize St. Ivany. You criticized Keane. I don't need my team's players to play at this tournament, so my opinion on Keane's omission has more to do with the USA taking an inferior roster. I am a fan of the American team, and want to see my country win. I think not taking our two best RHD is going to hurt the team. Kemp is a defensive defensemen who will play PK. He was competing with Emberson for a spot. You don't seem to have a great grasp on the defensemen who were in contention to make this roster, yet you are criticizing them and trying to tell other people what they should think about this roster.