I kinda have a feeling that Irvine might join or rather help band of the hawk. First, Irvine already is slowly losing respect for griffith and we can see this in the last chapter where locus had to make him kneel for respect. And also Irvine was always very secluded from the gang unlike rakshas who‘s power depends on secludedness Irvine decides to be alone from the gang and he always feels like he doesn’t trust anyone. I feel like he has some plans in work with zodd (completly fan fic no proofed theory) to help casca that will cross with charlotte or something. Either way I just hope irvine is used properly by studio gaga, he has so much potential and I hope he gets a back story. Even just a small one I’ll be happy.