I don't literally mean steal...
Usually games that show at one consoles E3 presentation generally (most of the time) have some sort of marketing deal with that console, be it a major deal (like COD) or a minor slap-a-logo-on-the-end-of-trailers (like witcher 3).
MS had Metal Gear V: TPP opening the show at E3 2013. Now this wasn't a mere trailer like slapping Dark Souls 3 in the middle of your conference, but this was a big presentation with the first gameplay reveal of the game, and even had Hideo Kojima come out and praise the game as being 'amazing on xbox with great visuals and smartglass'. One of the gameplay vids that came shortly after that even used 'xbox buttons' (although that could've been PC)
Opening or closing the show usually means xbox are getting behind that game, so it's weird (isn't it?) that 2 years later (even less than that) metal gear v trailers have the complete sony marketing package (PS Logo, custom consoles, hardware bundles and more)
Obviously, being a japanese company, preference would edge towards Sony if the choice was given, but it looked like it was going to be a xbox-marketed game from the way Don Mattrick bigged it up (and pretended to be friends with Kojima)
Do you think Phil Spencer got rid of the deal, seeing as it would have minor impact? Do you think Sony 'stole' it? Was the Konami/Kojima fued all to do with this perhaps?
