How does this get spun as a positive for future signings? "Hey, if you sign here and you don't win the starting job, don't worry. We'll actively try to ship you off somewhere else that you probably didn't want to sign with in the first place!" Man, what a win!
I think the party line would be this "Even though you didn't win the starting job for us, we value you as a backup and depth player for this roster. That said, you have an opportunity to start elsewhere, and even though keeping you here would be better for us right now than giving you up, we won't stand in the way of your opportunity to start in the league."
That sounds like a good company line to me.
That said why would St. Louis want Vick anyways?