@Fcrate, a couple of things about that.
I cannot vouch for what a corrupted Marcone could become in the future, but for now, he wouldn't try to do the "repent" thing with the Knights. He is too...honest for that. At least, for now. And in the battle he was on the same side of them, so for now, they have no reason to come directly after him.
Hendricks, yes, I thought the same. Still, Marcone can still die. He is not Nicodemus. Only, it is more difficult to kill him now that he has the coin.
And I did not like the banner thing either, but I don't think is all about hired muscle. I think the people following Marcone Banner were like Harry's, common people that decided they rather fight for their loved ones instead of run.
And I want to know if Marcone's banner was bigger than Harry or not.