Partial offset language contained in the contract. Once filed with the league and reviewed then the 'partial' details come out.
I don't think there was ever any doubt, just conspiracy theories. There was about a 1% chance Chip was getting MM even from the outset of the draft. Once Tenn had him in their sights, they were not giving him up. Not for a boat load of picks, not for Foles, not in any trade after the draft. A superstar QB talent falls in your lap, you do not trade him. _