PRO-PLAYER HACKER

It's impossible. They'd be catched in the beginning of the game, so the match wouldn't even start. But if you mean by pro-player just streamers/players in high-ranks, it is possible that some of them might cheat. Gosu is pretty mysterious, he got many times banned and catched on situations that he seems to be scripting. Im not sure if he's really cheating, I saw many of videos explaining he's innocent, but I don't know what is really true.