Well, there's also Milked, Cloud/Cold, Mudslide, Smolder, to add to Lumberjacks, Cardinal, and Celadon.
So uh, Edge, Time, Xavier and Mythos (MYTHOS LI PLS EDGE), on leader? Maybe Mythos being leader and a newbie to the school would be a little weird. Even if Nonus Nameticus was their leader, it'd be kinda weird. Though it could open up more opportunities with interactions. I don't really think that Lien should be leader. Personally, I would prefer Jett or Mythos. The former is happy, protective, seems to be the most charismatic and his character sheet literally says 'born leader,' so... Mythos seems like a planning person leader thingamajig. (Don't I English so well?) Then again, that earlier point about her.
Another thing that would need to be considered is the relationships between the characters. Who favors who, who doesn't favor who, and a few little things like... Nonus Nameticus and the others. Lien and Jett studying together because they have a lack of experience with academics. Them all bonding over their humble backgrounds. Is Jett racist? Towards faunus? Because Lien kind of is towards humans.