People focus too much on Ryan. The zone issues were not all his fault. There was a lot of miscommunications in the secondary. That is on Patricia, McCourty (who calls the assignments), and the defensive coaching staff.
And the fact that the Pats played a soft zone with a two and three man rush, is 100% on Patricia. You can't expect the players to make plays when you put them in a position to fail. I still don't know how you can drop 9 players into coverage and still give receivers a 5-10 yard cushion in gaps in the secondary.
Matt Patricia was the biggest reason the Pats failed last night on defense and there wasn't a close second.