I was thinking, if everyone is feeding the chaos gods, which they are cause, lets be honest, there is no way to not feed them, the only chaos god that could not be defeated or crippled would be Khorne. The only way to stop feeding him would be to stop wars and murders and the like. Now, assuming that the whole universe does not get a mind wipe, which would effectively render the chaos gods almost powerless, I believe Khorne would be the most powerful.
I may be wrong but I was just wondering, what are your thoughts on this and why?