broader shoulders

often overhead presses rarely get my delts sore, but i notice that my mid back si a lil sore. i know soreness doesnt relate to growth, but i just thought i might add that.
more on topic, when people mention broad shoulders, is it caused by a wide midback or wide lats or just ripped, buff deltoids?

also sometimes i think that my anterior deltoids pull my arms foward, making me look less wide. is this common, or logical?

nigger