Not impossible... but not damned likely.

[He died under Bones' hand just like any other mortal would. The doctor's expression remains just as closed off as he continues to mull over his experience with mind control.]

So then we have someone who came from the Ship, was living in the Old City pre-timeslip to die from the plague, but he would've had to have turned up before any of the rest of us woke up. Especially given that now he's apparently in good with Bellona's leadership.