Here's a few:
1) He's rumored to be a pain in the clubhouse. He has fought with coaches in the past, including one massive blow up that was caught on camera during a game. A few Philly beat reporters pointed out this is not the first time he had a meltdown on a coach at a game or a practice. Some even pointed out it was surprising that the Eagles cut Avant and didn't try to resign him to a friendly deal because Avant was the one guy who seemed to be able to control Jackson. Even Vick couldn't and he said so as much when he told the NY media that he hopes Jackson can get his crap in order.
2) There are photos, posted by himself, on Instagram of him with gang members. He actually signed one as a rapper for his label. So while he might not be in a gang himself, he makes no bones about the fact that he has both acquaintences and business relations with known and alleged gang members. He's also posted pictures and been caught flashing gang signs himself. Those connections alone are a major headache.
3) There could be another legal issue hanging over his head as well surrounding his house being broken into a few months ago. It's been rumored that he filed an insurance claim and he might have committed insurance fraud.
4) He has a concussion history and is one big hit from spending a sizeable chunk of time injured. At his size, that's a concern.
I know people don't like the Eagles but they are generally a solid front office. They have the cap space this year and it would make more sense to cut Jackson next year, not this year, for cap purposes. So if they are cutting a 1300 yard WR who really isn't a cap issue for them, then something ain't right.
