Roger Goodell, sandy-haired and fit at 51, is the steward of the multibillion-dollar NFL juggernaut, having attained the job he dreamed about back in college. Over the first 4½ years of his tenure, he’s had to address numerous crises: Spygate; player discipline, most notably in the Michael Vick case; an epidemic of concussions; and the problem of how to keep players from maiming each other on the field. All the while, one thing has loomed very large over the commissioner: the shaky labor deal he inherited.