I thought we were trying to help out a college player here?
As far as your doctor being wrong. Let me say this. I was a part of a nutritional "experiment" where we would log meals every other week, give a rough calorie intake, etc, etc. The study lasted for 6 months and then we had a meeting 6 months after. So from the point I started the study until the last meeting we had a year apart.
During this time I never juiced, no prohormone, no nothing. Just good old nutrition, staples, working out, taking a few boosters, stuff like DTH, ALA, Activa Xtreme, amongst others.
Long story short. At the beggining of the study I weighted in at 190lbs. At the end my weight was 245. Granted, I went from a 13% BF to a 20% BF. So from 165 lean weight to 196. I may not be a math genius but that's 31lbs in 12 months. A little above 1.5lbs a month. And during this time I had about 3 cutting periods as well.
And all of this while working a full time job and working on my masters, while being 23 years of age.
So forgive me if I think that a testosterone packed 18 year old COLLEGE ATHLETE could actually achieve 10-15lbs in a season of workout... He wouldn't have to worry about work, school or whatever, only how to build his body for challenges ahead. And shall we add that depending on the position (QB in particular) he will not need to go for a "clean bulk" unless he's a scrambler. He may as well put on a few more lbs of fat that will also help him out in the position, help in his durability, ability to shake tacklers and increase his overall strength.
So his goals are, in fact, very doable. Specially if he put in a good effort and have a good nutrition to go along with it. And I don't think I have much to add here as far as what he'd need, just creatine, pre workout supplement, ALA, Chromim Picolinate, some Cissus for his joints, a multivitamin, protein and carb powder, etc.
Good luck to you guys.