Amazing! There are 3 flaws I see (that I interpret it as. First, I don't believe Dredgen chose to make Rose into Thorn. It is a Weapon of Sorrow, just like Necro. He just got screwed when he found it again, this time as Thorn. Second, and I know you said this was a guess, I doubt that he was there for crucible. Everyone already knew he was a murderer at this point (killed the Crucible titan and Pahanin). Lastly, was it [i]his[/i] ghost that stumbled upon the team on Mars? I thought it was the ghost that came to Mars looking for a guardian but never did, and so he discovered Cabal Intel for the Tower, etc.