Who should I rank up to help me get cavalier completion?

ProximaMidnight_8

I completed 6.1.1 easy but died so many times on sentinel and ultron. This is my roster. Who should I rank up to help me push for cavalier? (btw I'm probably the worst ghost player ever, I've watched videos but im still really bad.

RaviDavi

I don't think you need to explicitly rank up more champs to become Cav, those you have at r3 and up should be enough. (Especially Warlock)