Breh, we're talking about college football. Three-a-days until school started, 3-4 hour practices daily after that, not even counting weightlifting in the morning. The overall number of calories burned is incredible. I used to eat by filling my tray in the dining hall with like twice the food a normal person would eat, eating it all, then filling it again after that.
But I was a 17-year-old and the amount of mass you can put on at that age is incredible. From around 17 to 25 or so your body is just begging you to build grown man muscle on top of your base. I wasn't even touching any supplements other than creatine, no protein drinks or anything just enormous well-balanced meals, and I not only added 15 pounds of muscle but probably converted at least 5 pounds of fat to muscle just those first few months. Offseason was all weightlifting, sprinting workouts, AND cardio, and added another few pounds (some fat-to-muscle and more on top) after that. My bench/squat/clean maxes jumped up by something like 250 lbs combined in 14 months before I blew out my knee on the field.
BI is in his 4th year past high school. He should have been adding weight every year. It's a really rare person who at 22 still doesn't have grown man muscle structure when working on their body is their full-time job. It's past time for him to have taken care of that aspect of his game - you see how important it is whenever he drives inside.