I'm going to come clean--Mr. Sarcastic is indeed Tim. :) He went by that pseudonym for a little while back in the "Young Justice" comic book. *grin*

However, ironically, Jason is showing up as Robin in the next chapter! *dances*

I've tossed Damian around in my mind! There could definitely be space for him being Bruce's real son, born while he toured with Ra's--but maybe even better would be having it be kayfabe, lol...