Nobody knows
what Manco is; he's very introverted, which I think leaves some people feeling uneasy. It's hard to trust something you can't really fathom.
I actually wouldn't mind Vlam as a moderator, for the same reasons MrsKJJ pointed out. He knows how to navigate this forum; he's tough but fair, and I think he walks a fairly neutral line for the most point, tending to be objective and base his observations upon evidence as opposed to his own personal thoughts and concerns.
He won't be selected though. ¯\_(ツ)_/¯