VANDERBILT Clark Lea’s ally in Vanderbilt football’s rebuild: Former NFL coach David Culley | Estes Gentry Estes Nashville Tennessean The Sunday after the 2021 Colorado State game, Clark Lea’s first win as Vanderbilt football coach, the Commodores were taxiing out for their flight back home when Lea received a FaceTime call: David Culley. Lea was surprised. Not that Culley would reach out, but that he’d do it at that moment, on the NFL’s opening weekend. Culley was about to debut as head coach of the Houston Texans. “He’s in the tunnel about to walk out for his first game,” Lea…