a lot of our offense is RPO based. The offense runs the play the defense dictates. When Purdy threw that pick six, its obvious they confused him. Very possible they disguised their defense into a pass look pre-snap and bailed into pass coverage.
Just a wild assumption, but the result (a pick 6) makes me think they did a good job confusing our quarterback pre snap and again post snap. Good teams do that. Especially late in the year after they get film on you.
That's a really good point. If it's an RPO then you can't totally blame Manning for the imbalance. Purdy has to make the right read, too.