Titus, you're wrong on some things.
1)
We still have investigatives left.
Go back and read who is skeptical of what.
2)
After vonflare death we still saw 2 kill flavours on D4. So
both Berlin and TVL are still around
. I'll explain.
Vyse (TVL1) died N2 (was flipped at the beginning of D3).
We lynched vonflare (TVL2) D3.
Cerb died N3 (was flipped at the beginning of D4).
Lucian was nuked from orbit at the end of D4.
Both Cerb and Lucian NKs were submitted at N3, that is the night after Vyse death and vonflare lynch, meaning TVL had 2 deaths going into N3.
If you believe the setup is 3 TVL/2 Berlin/2 WW, masons can't be scum. For them to be scum, it'd either have to be 4 TVL/2+ Berlin/2 WW or 3 TVL/3 Berlin/2 WW.
Present your case again when your scum count looks like either of the last two.
3)
NK protectors (doctors) and delayed-NK pretectors (like poison doctors) are independent entities.
Doctors don't protect against delayed kill
(poison, although the flavour is nuke from orbit in this game) and poison doctors don't protect against regular NKs.
No one claimed to be specifically the counter to the delayed kill, so basically the scum faction that has the delayed kill is perma strongman.