By Alex Prewitt The quarterback’s workouts in cities across the country may have seemed spontaneous, but dozens of trainers and receivers helped the events proceed smoothly. Xavier Rush was leaving the TSA checkpoint inside New Orleans International Airport one Thursday last month, headed to a weekend bachelor party, when he checked his phone to find four new missed calls, from four different friends in the area. All were inquiring about the same thing: “Everyone was like, ‘Are you back by Monday? Kap’s gonna be here. Can you run routes?’” No further details were offered in the moment—no time,…