Since we learned about Dr William Isaac Roberts, I've wondered if Duncan recognized Ink at
Dunbar. If Duncan knew him before the murders and didn't know about the legal stuff, then the tats would seem way out of place and probably given him pause as to letting him in, I think.
If Duncan knew him from prison and had seen him with tats then Duncan would have to have been an inmate who was released shortly before Zday (it's a possibility) and would know Ink as a violent felon. Maybe enough stuff was topsy turvy for Duncan in the post apocalyptic world that he was cool letting a convicted murderer into his home. Maybe he had some affiliation with Ink back then. Given Duncan's breakdown, maybe he had been in the mental ward at Cain with Ink....
Now that I've typed breakdown, I'm reminded of
Sean's words to CJ in the
Kalani flashback about her having had a past "breakdown." We don't know any more than that at the moment, but, :tinfoil: , what if CJ's breakdown was pre-Zday and earned her a stay at a particular hospital ward.... Hmmm.....