In 2009, Bill Bellichick and the Patriots traded Matt Cassel and veteran Mike Vrabel to the Kansas City Chiefs for the #34 overall draft pick, early 2nd-rounder. In 2013, new Chiefs' head coach Andy Reid released Cassel. Vrabel has since retired, and is coaching college football at Ohio State. The Patriots had no first-round pick in 2009, so the very first player they chose from the draft with the 34th pick was... former Oregon Duck, Patrick Chung.
When the Pats let Chung walk in Free Agency this year, he jumped at the chance to reunite with his former college OC Chip Kelly by signing with the Eagles. In Chung, not only does Chip get someone he knows and helped develop, but someone that the great Bellichick liked enough to draft that high. Not only do the Eagles get a versatile defender and special-teamer, but one that has been part of a winning system and team in the NFL, with experience playing at the absolute highest level, competing for the Lombardi. What better introduction to the pros can there be than being drafted by the Patriots?
The Chiefs do not have Cassel or Vrabel. The Pats do not have Chung. With 20/20 hindsight, the clear winner of that 2009 trade is the Chip Kelly-led Philadelphia Eagles.