I wonder how much of this new attitude has to do with the contrast between how his "homecoming" to the Browns worked out and the way the team is treating Watson.

Hunt:

Took full responsibility
Showed true remorse
Sought professional treatment

Put his head down and worked for peanuts
Signed team-friendly contract
8M guaranteed


Watson:

No responsibility
No remorse
No treatment

Red carpet
Sun, moon and stars
240M guaranteed / protected from suspension


May very well be the impetus for "time to move on".