I think that you can still make Steph a Batgirl if you want, personally. We're not strictly following continuity with this exactly or anything AFAIK, so Damian could not be Robin yet officially, but Steph can already be Batgirl. I kind of just didn't have him already in the position since talking it over with Ruby had us thinking that Damian taking the role for himself unsanctioned toward the beginning of the RP and then trying to grow into it could be good IC.