Just like Doc says above, Estro is spot on. The Bills probably would not give Bell a guaranteed starting spot, and the Eagles would. But the Eagles are protected when Peters comes back the following year. So this essentially gives Bell a guaranteed starting spot for decent money and the chance to showcase his abilities for next year's free agency period. That's probably the best Bell could get at this point. And I imagine the Bills are interested in something longer-term, and were not ready to commit big money to him for, say, a four or five year deal. Better to stick with Hairston and see if he can develop, or pick a LT early and have him develop with the rest of the young guys.