1. All the changes on offense. So much has to come together. Five new offensive line starters (until Mike Pouncey returns). Knowshon Moreno, an upgrade but still an average running back, is missing time with a knee injury. Ryan Tannehill has had good, not great, development. The new system of Bill Lazor will take time to learn, in additon to the question of how much of Philadelphia's success was his doing and how much was Chip Kelly's. And while the receiving corps is deep, it doesn't have a lot of proven people who have got in the end zone. The Dolphins were 26th in scoring last year. Will they be appreciably better this year?