bhanks should focus on getting as shredded as possible instead of focusing on fullness. That is his strength as opposed to billowing muscle bellies and "aesthetics." Shreds you can control to a higher extent than the other stuff which is mostly genes. Shreds have to do with genes too but there is a measure of control through suffering. If he really isn't doing any stimulants he should consider clenbuterol, at least for a few weeks. It doesn't eat muscle, it protects muscle and is in fact slightly anabolic. Ephedrine too, saves lean mass on diets. Alternating clen with ephedrine every 2 weeks and then both the last 2.
Insulin shines for genetically lean individuals. Might be a good choice especially with the chrons when "holding weight" is a problem. Nontoxic natural hormone.
If I were him I'd shoot for being completely ready 2 weeks out on high protein, then switch it around for more carbs to fill out slowly.
Anadrol if orals aren't out of the question due to stomach issues. IMO Anadrol along with tren are the 2 best diet drugs.