The Bills are not ready to use their tag on LB Cowart. They want to continue to negotiate. So now they have eight days until Cowart can test the free agent market. At issue: how much of Cowart’s signing bonus should be paid up front. The Bills want to defer payment of much of the bonus until after the season so they can assess his recovery from a torn achilles tendon. His agent, Gene Burrough, says the Bills are essentially looking for a guarantee from Cowart that he’ll never get hurt again. The agent says there’s a 50-50 chance at best that Cowart will re-sign with the Bills.