He's Punisher, I'm certain of it. He posted a picture on Instagram a few months back tagged with 'FrankCastle', followed by this tweet: "#FrankCastle says go **** yourself Friday. LA, CA. @RussCundiff @nathanedmondson @Marvel". And don't forget the writer of the Punisher comic saying "[Milo] would make a helluva Frank, right?" and Milo also tweeting "Hating the world right now buddy, Punisher style". Frank Grillo also tweeted a while back to "forget being a rockstar - be in a Marvel movie", to which Milo replied "Sounds like a plan." Add in DeKnight's constant tweeting about the character - I'd say it's all but confirmed at this point. We'll be seeing Punisher a lot sooner than any of us initially thought I reckon