I would argue that a real star is a multiple Pro Bowler. Biscuit? Maybe. Talley, nah... I loved the guy but he was more a local hero, maybe he should have made another Pro Bowl (I know he made it as a coaches choice), but he wasn't as great as Takeo. Takeo was a 2 time ALL-PRO, as in best in the league at his position.
TO, WAS a star, but as the other guy noted, he was talking about guys that were stars while playing for the BIlls, not guys finishing out their careers.
London Fletcher? C'mon.