From personal experience is impossible to get that big and fast without ROIDS, every competitive athlete have used ROIDS at least one cycle in their life, Growth Hormone(GH), insuline growht factor(IGF-1, IGF-l3), this things arent checked by the NFL, well not yet.
Michael Johnson(sprinter) was in lots, lots of GH but Nike protected him and many other cases are underground for the interests of the publicity companies.
Do you really think that you can have 80pounds of clean muscle up to your body with a Body Fat of <10% naturally? only lifting weights and eating right?.