The Bills already understand the daunting challenge they face Sunday in hosting the dominating and undefeated New England Patriots. Now they might have to do so minus their top offensive threat: running back Marshawn Lynch. Coach Dick Jauron on Wednesday all but ruled out Lynch from playing after the rookie missed practice because of a severely sprained left ankle. "It's very sore right now, and I would say we're not overly optimistic," Jauron said, referring to the chances of Lynch playing. Jauron then raised concerns that the injury, which Lynch got in a 13-10 win at Miami on Sunday, might be severe enough to keep him out for more than one week.