lol
Coaches are there to be like a reminder. They call out weapon spawns and power up spawns. They also reinforce callouts to players, give positive feedback and hype the team up. These players are like zombies out there, all Adderall'd up playing game after game after game. Coaches also remind players to keep an eye out for enemy spawns and maybe tell other players on the team when 1 guy needs help running a flag or holding an oddball. Things like that basically.
Honestly I don't know if I'd be able to play with a coach. These guys are season tournament pros and so they're used to it. I don't know if I could have another guy calling out stuff in my ear that's not on my team. His voice would just seem so out of place.