The Bills added Mario Williams this offseason, but that doesn't mean the defender will wear No. 90 for the team this coming season. Buffalo defensive end Chris Kelsay will not give up his jersey to make way for the prized free-agent addition, according to the Buffalo News. Williams will soon be assigned a number so the team can begin selling his jersey to fans. "I spoke with Mario. I actually brought it up to him, he didn't bring it up to me. He completely understood," Kelsay said. "I've worn it my entire career here. A lot of times in a situation like this, the guy will buy it from you. But I'm not really interested in that." Kelsay has been on the Bills for 10 years. "People who have never played don't realize how attached you can actually get to a number," Kelsay said. "Having played with it my whole career, it was something I don't really want to part with, and he completely understood. That was basically it."