One of the best things about the last CBA was removing any (turns out, most) reasons for rookie holdouts. Looks like the Chargers have found a way to create one anyways.
http://profootballtalk.nbcsports.com...bosa-chargers/
Best description of the situation I've seen is here
http://profootballtalk.nbcsports.com...osas-position/
By all accounts, the problem seems to be that the Chargers want their cake, and eat it too. They want offset language and a deferred signing bonus. Bosa reportedly wants only 1 of the 2, which has been the precedent before now.
Curiously, a few players (and a the coach) have come out with statements like "he's missing important reps" and "he needs to sign the contract" and not "it's business" or "the team needs to get him signed"