I'm not an expert, but my opinion is that Profile Managers have the primary responsibility for managing profiles (see how that works!). Secondary responsibility for cleaning up from a merge should fall on whoever proposed the merge - just my 2¢ there.
As one of the PMs for Jehu's profile, you have the right (and responsibility, if you agree with my opinion) to clean up the bio/sources errors and duplications. You are free to remove the Unsourced tag any time.
Since the profile is open, I could even do it myself!