Alright as long as you're ok with it, go ahead and post your analysis then I will post mine and add him to the list.
If we lock the heroes and get our one more villain, then that means nobody can sign up at all. That can effectively kill the RP. What I would like to do is go down the list and do a VM rally, giving people a week to post for their characters before they're marked inactive and dropped from the list entirely after a month. At which point if they want back in they'll have to get re approved and find a way to let back in the storyline from being made an NPC. We can't keep dead weight on the list, because it limits who can sign up.
As for buffing the villains, that doesn't really work because effectively they already out number the heroes. It doesn't seem to be that way, but they do. You should just make this better known, by having a higher presence. The villains are not weak, but there's not enough of them being shown. I realize giving you more work to do is bad, but the alternative is making the villains unbeatable at all.