'Cassel's cap figure, about $2.5 million less than Manuel's, drove this decision. The Bills are trying to re-sign defensive tackle Marcell Dareus to a massive contract extension – ideally before the opener, though that could be difficult – and they need every penny they can find. Since the roster paring began late last week, the Bills have released 21 players and have trimmed more than $14.3 million in salary-cap space, second only to the New York Giants.'