5 will get you 15 that he's the SK
Certain things I know to be true:
1) Scum likes bringing attention to the "thought" that there is some sort of killer out there, but never holds to a name.
2) He seems awfully sure (along with others) that there is an SK. Whereas there are other possible situatios not being spoken about
-Loose Cannon Vig
-Action Switcher
The 2nd is less likely than the first, but a loose cannon vig is possible as well.
I would love to see where this goes from here.