I agree with you Creg ny Baa.
Although I haven't watched the whole race, I have seen highlights. Marquez seemed to be messing with Rossi, and purposely trying to spoil his race.
On the corner where the crash took place, that's happened to me in the past, but it's a brave man who does what Marques did, (i.e. lean back on Rossi when he'd been run out wide). Generally the rider on the inside will be the winner, so.....what on earth was Marquez doing by trying to lean back onto Rossi. It just seemed a petulant move to me, and not one you would want to attempt if you fancied coming out of the corner in one piece.