Based on first 80 pages? I'd yeet SK. All this "gut feelings" push that's apparently some town masterplan now, after it failed. That would clear whole Flower situation and (maybe i'm biased), would tone down atmosphere here a bit (no offense). If she's talking truth about this whole Hunter person, there's a chance he's the one. That would be my invest candidate, more than vig candidate though. Nobody's interested though and i'm not type of person who'd solo lead a wagon on somebody, especially D1.
Other than this, T-Pein that buddies Flower so hard it's painful and apparently has no mechanical reason behind it. Which is just weird.
Then either Pero or Blue. Pero's been bad, but I can see situation where he's town in all this. Unlikely but still possible. I think Blue might be vig target though (i'm not asking anyone to do anything).