I think if Poly flips scum, Supa is implicated. I remember when he was scum with you, he used the MafiaScum version of Oracle. The Actor that Poly described comes off of MafiaScum.
My bodyguard is essentially a weak bodyguard because of the 50% mechanic.
Innocent Child is a great substitute for a Cop in the game and with a Tracker and two vanillas the game seems pretty balanced.
I'm not certain who I would implicate as his scum partner. At the moment, it's between you and Supa. I'd say that the mafiascum link isn't particularly persuasive to me, mainly because when Supa and I were a scum team, we both arrived at our fake claims separately. I don't see him feeding claim options to Poly, though I don't rule it out.
As for yours being a weak BG, from my knowledge, yours would actually be a strong BG. A weak BG would be that you just die in place of your target if they are the target of the NK. This sounds like what you said from the start, a sort of coin flip Doc or BG.