That's an excellent solution. I think part of it is also being comfortable and firm and not teaching others that "Hey he's the go to guy and he answers question

That's an excellent solution. I think part of it is also being comfortable and firm and not teaching others that "Hey he's the go to guy and he answers questions immediately and is super helpful". Eventually the problem sorts itself out. And even if it doesn't, so what, you're one person. There are limits and real costs to being a human operating switchboard.