I think Hamelin is not so good in GG.
If he is playing the rat game he hasn't enough play time... as an Obey master with other guys do the job he is still good, but his rat engine does not work in tournaments.
Leve is more flexible because of his hiring pool.
My ranking:
Leve
Jack/Hamelin
Viks (if it is killing time)
Tara (6 AP is always good)
Parker
Misaki (better in 10Thunder) / Schill (can't rate him, because no experience)