After the big kahuna hit over the weekend with Jon Gruden officially going to the Raiders, one of the next head-coaching dominos fell. It is going to involve Andy Reid’s coaching tree adding another branch, as Chiefs offensive coordinator Matt Nagy was hired by the Bears, the team announced Monday.The decision by GM Ryan Pace, himself just 40 years old, to hire a youthful offensive coordinator — Nagy is just 39 years old — as head coach follows a couple of trends and makes some logical sense in terms of trying to develop Mitchell Trubisky. Nagy is one of several former Delaware quarterbacks to find success in the NFL. He joins Joe Flacco and Rich Gannon as famous Blue Hens to make it big, although the other two obviously hit it large as quarterbacks in the NFL. Nagy spent time in the Arena Football League before getting into coaching, joining the Philadelphia Eagles as in intern in 2008. He would rise to offensive quality control coach by the 2012 season and then join Reid in Kansas City when Reid was dismissed by the Eagles and hired by the Chiefs that offseason.