USF announced Monday that six of its 24 recruits who signed during December's early signing period are enrolling early, perhaps giving the Bulls some scholarship wriggle room on the Feb. 7 signing day.The early enrollees: DE Dwayne Boyles, LB Antonio Grier, DE Stacy Kirby, RB Brian Norris, WR Zion Roland and P Trent Schneider. Roland (Admiral Farragut) is the only local recruit of the group.If you're handicapping which could make the earliest impact, Grier — a two-star prospect according to Rivals and 247Sports — could be a safe choice based on the lack of depth at his position. USF will enter spring practice with only two linebackers — Nico Sawtelle and Greg Reaves (a hybrid who played some linebacker down the stretch) — who have started a college game.Just how many scholarship spots remain available for USF in February is unclear.Division I-A teams are allowed 25 players per signing class, albeit with some provisions. If a school signed fewer than 25 the previous year, some of the current year's early enrollees can be counted toward the prior class. USF signed 23 players in 2017.Another factor is grayshirting, where a recruit signs in February but delays his enrollment until the spring semester of his freshman year.But even with such provisions, USF doesn't expect to sign more than three or four more players in February.