Apparently the reasoning is similar to Mariota last year. Has to do with whether or not he should still get paid if he gets cut AND signs with another team. Gotta say, I side with the team on this one. Didn't really follow the Mariota thing to see how it played out.
https://www.yahoo.com/sports/blogs/nfl- ... 25465.html
https://www.yahoo.com/sports/blogs/nfl- ... 25465.html