I have no idea if this is true. I do know, however, that JJ has a bitter taste in his mouth about the way his career ended in Miami. What better way than to change the end to his career than with one of the Dolphins' bitter rivals.
Whatever you might think about JJ, he would create a lot of excitement for the fans and for FA's who might not otherwise want to sign with the Bills (especially with the current HC and GM).
One final thought. Ralph is getting up there in age as everyone knows. He would love to win a Super Bowl. It would not surprise me if he did something like this. It would not surprise me one bit.