As for the others, they attacked Rittenhouse while trying to supposedly disarm and detain him. That may be a little murkier territory because they were, in theory, acting as good Samaritans. However, Rittenhouse was very obviously moving towards police, they had no authority to do so, and they quite obviously came prepared for trouble as one of them was armed with a handgun.
I'm sure am Illinois prosecutor would call this a case of mutual combat and move on. IMO, that's the closest thing to it. Neither side is technically wrong here when it comes to the second and third shootings. There was just a misunderstanding. Rittenhouse was just a better shot and kept his **** together.