Lightsage.
He's one the smarter players I've seen around. He's also very organised and creative. I'm sure he'll manage to handle TK's previous activities and will bring new ideas to the alliance. He's seen a lot of MD's history and knows at least a bit about everything in this realm (which I think is a good quality for the TK leader). He's also already experienced with leading and dealing with people, and as Burns already said, he can handle pressure. He's also a great observer!
~Aelis