CHAPEL HILL, N.C. — And you thought “doubtful” actually meant playing was uncertain? Please. Then you don’t know Joe Vellano very well. The illustrious all-American, the walking embodiment of the Maryland pride and spirit, had been hobbled by an ankle sprain suffered during a Georgia Tech cut block on Nov. 3. Ever since, Vellano was limited in practice, a shadow of his former self, unable to display the moves and flash the speed that made him a two-time all-ACC defensive lineman.