User blog comment:Avatar226/S-Class Contest/@comment-7577835-20131214202759/@comment-24066070-20131214235327

I thought their relationship became "official" during the seven years, that's why I listed it. But you may be right.

Miliana could have joined earlier, but it was confirmed post-timeskip. Also, she mentioned Kagura asked her to join and I get the impression Kagura is several years younger than Erza, so she may not have been recruiting people before the Tenrou Arc or she may not have been aware of Jellal killing her brother. Kagura may not even have been in MH at that time.

About RT, you're right. I had forgotten that they became legal right before the GMG.