Everyone is searching for the truth, and finding little. Why would the Eagles let their best receiver go? Possible answers:
1) Jackson is a dangerous criminal - Ah, no.
2) Jackson is a locker room cancer - might very well be a part of it, but IMHO you just don't let talent walk away unless you think you can replicate his performance or
3) Jackson's strengths don't fit into Chip Kelly's way of thinking. OK, maybe #2 and #3 have something going here.
I don't want to speculate on 2, but as for 3, well, the article over at Chip Wagon got me thinking - maybe if he were building a team from scratch, Jackson wouldn't be a Chip Kelly kind of player. So I had forgotten that Chip Kelly loves big plays, but he loves the avoidance of negative plays possibly even more. Hates INTs, hates sacks. Foles seems to be really good at avoiding the former, not so much the latter. What's a coach to do?
Jackson has great speed and skill, and Chip was certainly creative at getting the most out of his this year, but what Jackson does best is go deep, which even at his speed takes a while. I looked for some kind of statistic which would help show how long Foles (who according to the Chip Wagon article was one of the slowest throwers in the game last year) took to throw to Jackson vs. other receivers, but couldn't find anything. So speculation is called for. Are the long routes a result of waiting on Jackson to get open? Are there sacks and pressures resulting from this wait? Is some of what you get with a player like Jackson more sacks, QB hits, and turnovers?
If Chip wants a QB to get the ball out of his hands in 1.5 seconds, or at least in less than 3, it calls for a player with different skills than what Jackson brings. Think a player like, I don't know, Darren Sproles, instead of Jackson. Or Welker. Basically a guy who can get open quickly, which Jackson can do, but not so well that he's worth $10 million in a Chip Kelly offense.
I propose that Chip wanted to use the $$ tied up in Jackson in different areas, and wanted to clear the locker room of a personality which, though not bad, wasn't worth to Kelly the money and trouble. Going back to what Michal Vick said, some teams want to do things a certain way. I think that on the field, Chip wants to do things in a certain way, and players like Jackson are not the way he wants to do things.