It never thought in terms of training individual bodyparts when I was a world-champion powerlifters, and I certainly never did any specific shoulder exercises as part of my workouts. In those days, I’d think in terms of doing bench presses and squats, not chest and legs. So when I switched to bodybuilding, I had tremendously strong front delts from all those years of heavy benches, but my side and rear delts were lagging.
Let me add that my benches back then weren’t strict, bodybuilding benches, but an all-out powerlifting movement — bringing the bar very low, arching and pressing up using a lot front delts and even lats as well as chest and triceps. I was always a shoulder presser, which gave me even more disproportionate front deltoid development.