Think it's currently Larry Braggs, who followed Brent Carter, Melismo, but at one time, apart from Lenny Williams, Rufus Miller and Rick Stevens, the Band was lead by Eddie McGee (of Crossover Monster "What Made You Change" fame).
Have been playing "It's So Nice" from the "Aint No Stopping" Columbia '76 LP recently. Eddie is on there, sounding superb, but I think that was the only album with him on lead.
Sean