Doesn't matter who, they are all connected to the hive mind. Would be a great idea to give the clan with a record full of bug abusing, exploiting and hacking have admin on the server where they are 20% of the population.
While I agree with the hivemind part, there still are some mature people in Grey Order like that Erasmas guy or whatever his name is. Of course that Harpag shouldn't be given admin powers and reason for that is pretty simple, he's not even playing siege as much he's playing battle. So it should be someone mature, responsible and active siege player. I'm sure even Grey Order have someone like that among their ranks...
You're also right about second thing but that's not how things work in c-rpg. For example, I remember that chadz threatened Ujin that he will ban the whole clan if they don't change their behaviour (have no idea what it was about but I remember when chadz posted and threatened). Today Ujin is admin and everything is cool between them. It seems that past deeds are easily forgotten in c-rpg so I really see no reason why someone from Grey order shouldn't be admin.
Main reason why I'm nominating one of them isn't because I like them (I don't), it's because they are very active siege clan. Mature and active players should be admins, inactive admin can be a cool dude but he's bad admin simply because he's not doing what he's chosen to do (playing the game and admining while playing).