During the telecast on Sunday night, Chris Collinsworth referred to the Eagles running the "read-option pass" during a 3rd down conversion to Zach Ertz in the red zone. It is evaluations like this that make people conclude that the Eagles offensive scheme is simple and predictable. Yes, it is based on a smaller set of simple concepts, but the beauty and the complexity of the scheme is in the various options, various looks, and the different ways Chip dresses his plays up. Chris Brown has written some great stuff about "constraint plays". Chip Kelly is a master at drawing up various combinations of his plays and creating different options to catch defenses off guard who think they recognize a given play off film.