GAINESVILLE — Florida offensive line assistant coach Darnell Stapleton is heading to the NFL, leaving coach Billy Napier to make another key offseason hire to make as spring practices approach. Stapleton’s departure to join the Washington Commanders, who announced his hiring Thursday, gives Napier options with his on-field offensive staff. Stapleton joins Dan Quinn, the Gators’ defensive coordinator in 2011-12. Napier opted for two offensive line coaches, Stapleton and Rob Sale, during the past two seasons.