"Blake has lied about the death of Jenna (for whatever reason). She is alive and well and returns to Gauda Prime after the events of Blake. She finds... well, surprise me."I hope I did. I don't think that Blake lying about a friend to someone he was testing is necessarily AU though, but you may take my reading of Blake and Tarrant as being so.
As always, thanks to astrogirl2 for her excellent beta.