Kelly wants players who will buy into his system and not be selfish. Throughout last season, Jackson said he bought in. He said he was trying to get more sleep, as Kelly requested of all the players. Jackson said he was more than happy to contribute on special teams, because Kelly preached the value of the favorable field position effective special teams play could provide. Jackson said he supported Nick Foles, even though he preferred Michael Vick to be the Eagles' starting quarterback.
But clearly Kelly didn't like something about Jackson.
Otherwise, the team would have muted the noise this week about how it would entertain offers for the 27-year-old receiver. All the Eagles would have had to say was that they are committed to Jackson, that they value his skill set and that he is not on the market.
That hasn't happened yet.
One opposing head coach told me he didn't think the Eagles were shopping Jackson. Two other head coaches, whose teams would likely pursue a trade if Jackson were available, told ESPN NFL Insider Ed Werder there had been no conversations with the Eagles, although one said he understood that the Eagles would be willing to evaluate trade offers.
The truth is out there somewhere.
That Kelly would be willing to let Jackson, an irascible talent on his best day, hang out there amid rampant speculation is telling. The message is clear: No one player is invaluable. No one player, no matter how productive, is safe.
Kelly spent his first year in Philadelphia changing a culture and implementing his plan. It worked. Now he has the power to do more, to build the team how he likes, even if it means potentially trading one of the team's most valuable assets.
Winning earned Kelly power, and it appears as if he is more than happy to wield it.