To be honest I don't get where this "there are lots of 4's" has come from either, the only one I can see is Psy, unless Michael and Warren have got a storied history that no one has filled me in on. Either way that's no reason to be choosing someone or not anyway, it doesn't make a jot of difference whether "there are too many of this type of person on staff!"or not, all that matters is how good they'll do the job.
edit: oh I see, in this group of 10. Well, either way, I still say the way they'd do the moderators job is far more important than what sort of flavour they add to the staff.
