Insulin and glucose metabolism are very interesting. Great observations, disgusted. Too much GH and slin abuse. Guys can't get rid of the hardcore fat stores because of impaired glucose metabolism and insulin resistance from GH abuse. They're wonderful in small doses but the synergy between them is parallel in both pros and cons. They work AMAZINGLY together, but they're also amazingly destructive if abused.
Insulin is such a strong storage hormone, you can't bulk haphazardly with it. It also promotes fat storage. People forget about this. The fat cells become brutal and hard like rock. Normal fat cells should break down with ease, but I've noticed that the last little bit of fat is amazingly stubborn. And I can imagine that if one abused insulin, it'd just compound to that issue to the point where it basically doesn't break down. Glucose metabolism is too impaired and the body doesn't/can't break down those fat stores like other subcutaneous fat stores that inflate and deflate with relative ease. That visceral fat that's been transformed is basically there to stay.