A link that compares Cassel's first 7 starts in KC in '09 to Kolb's underwhelming performance in his first 7 starts in AZ in '11. They look very similar (that is they are both pretty awful) but the big difference is that Cassel had a solid year in '08 in NE while Kolb has yet to show any kind of sustained high-level performance over any period in the NFL. You look at Kolb's career numbers now and they aren't pretty. Given how badly QBs have struggled the Eagles have traded the last several years (Feeley, McNabb, Kolb), I have to think that any team will think twice before giving up meaningful players/picks in return for an Eagles' QB that Reid is willing to move.