User blog comment:Omega natsu2/Chapter 369: The Place Prayers Reach, Predictions./@comment-4449950-20140128032255/@comment-4449950-20140128053947

Actually, the whole "OS were child slaves" thing is actually started out as anime-only. In fact, I'm not even sure if it is confirmed that Mashima has written it into the canon FT story or not :/ It's why the anime-only people are confused as to why Kinana is human - the anime stuffed up by showing a young Cobra with a baby Kinana, when in fact I believe it was mentioned that he met her as a fully grown snake shortly after she was transformed into it.

On that note though, even if we do assume the OS slave thing as canon, Cobra himself was shocked when he learned Erza was a slave, and Erza never knew they were in the TOH, so assuming Jellal knows their real names because of that is a bit of a stretch I think :/

But aye, here's to an alive Jellal \( ^__^)/