Oh yeah definitely. Cain is sure to leave his mark either figuratively or literally on people, places, and things. Once I flesh out a bit more of the au backstory and not just a "somehow we jumped from humble immigrant roots to a life of no good crime" I can figure out what might have been the big thing he did that got him his reputation. Right now (and in canon) Cain is actually just a nickname/codename so maybe his mark had something to do with that. I'll definitely run it by you when it's finalized so we can decide :)

Cain will enjoy his criminal pseudo lil bro :,)