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My next major goal is Cavalier - 6.1. I've completed 6.1.4 but my 5 and 6 star roster is still a bit too thin, don't have a Crossbones beater. So I'm deciding which rank up will help me both in completing 6.1 and in completing other special quests, etc. to build up the roster I need to do that. Right now I'm deciding between maxing out Colossus (5* awakened) or ranking up 6* Cosmic Ghost Rider to rank 2. Or if neither really helps me at a higher rank, should I just save those resources for someone else?