There should be an option for your weapon skin switching in game. Some people most likely have more than one skin for a weapon and can't decide which one to use so it would be cool to change skins in game.

How good is he in the pro games, what map is he usually picked on, what role does he provide to the team, how is he compared to other sentinels? Only watched a few Chamber matches so I can't answer this on my own. And frankly, I'm terrible...