Well I was just looking at Miguel's excellent salary cap page and looked over the numbers. And the on the field production for Vrabel did not add up to the numbers he was commanding. It's nothing personal against Vrabel, he was in decline and the team decided that they had to move in.
I think someone mentioned that Vrabel was also due a 1M bonus this season that the Pats weren't interested in picking up either. Trading away Vrabel to the Chiefs before a bonus comes due and saving over 3M in cap space is basically the same as a cut, but it saves Vrabel some face. He'll be useful in KC.
Lastly, I suspect that the second shoe may drop soon on Green as well. He's either going to need to take a major pay reduction or he might even get cut outright. The one thing that Green has going for him is that he's still a young player, however is the number of snaps he is getting, justify the cap hit? As a GM, BB has shown a clear history for making the hard calls and maximizing his cap efficiency. I look forward to seeing what BB does with the cap space that he has cleared.