‘Nall, 26, is expected to compete with Buffalo holdovers Kelly Holcomb and J.P. Losman for the starting spot. Losman was the team’s first-round choice in the 2004 draft, but there is a new staff and a revamped football structure in Buffalo, and general manager Marv Levy and coach Dick Jauron don’t have the same loyalties to him as their predecessors did.’