HAHAHA, oh dear god I want that to be canon! I actually think it would be a really interesting combo to have Dick as Batman, Steph as Robin, and Cass as Batgirl (naturally). Dick has the more experienced career and can set goals and such, Steph is snarky and fun and needs a mentor who won't mess with her head and fire her, and Batgirl brings in the awesome fighting skills and dark and spooky aspect.