As far as I can see, nothing has been settled even though Stax is dead. Well, other than that he was telling the truth about being a cop that dies day 1.
He checked marino who came back Umbrella, but Stax was paranoid so there's no confirmation there (there's also not a lack of confirmation either because he's paranoid, not insane) so that doesn't help shit.
Hip also encouraged him to target marino but apparently Hip always does this, so that reads town but I'm really not sure about his miller claim because that character doesn't seem miller to me. Luis Sera does.