I wouldn't reveal something like that quite this early even if I was. But I suppose there is some logic in your thinking. Since Kingmaker is always Town, scum is forced to make a decision to either shoot Kingmaker or let him keep making decisions. If Kingmaker is someone making the wrong choices, then scum will know about it since Kingmaker is revealed and just let him make bad decisions. On the other hand, if Kingmaker is making good decisions, he'd want to stay hidden because he's on to the Wolf team and wolves would want him dead ASAP. Honestly, I'd say NOT giving more information to the scum team is probably the best route, this I'd rather the Kingmaker stay hidden for now.