That's one hell of a curve ball. Why would Himuro (window opener) straight up lie about MC being the mastermind, even AFTER getting his toes cut off.
My two theories: Anzai (big guy) is a psychopath that wants to finally exercise his violence.
Or, Himuro honestly believes MC is behind all of this, because the person who gave him the orders said MC is the mastermind.
I'm definitely gonna try to read the RAWs, can't wait to see what happens next.