Didn't he come in close to 230-240 and Winters thought he was a linebacker? I do remember he gained weight again later and didn't like playing with it.
But Favre was never as big as BR. Favre was always willing (early in career) to take a blast while throwing, and he could move enough to make a sacker get a glancing shot at him rather than a takedown. What I remember (and Kevin Greene would support me) is that after slipping the big hit but still in the grasp, he would attempt to complete a pass. Often successfully.