First, I'm free to admit that I don't know exactly where along a limb the muscle mass really is and also that I have a very simplistic view of "short muscle" - so if I'm conceptually wrong, please correct me or point me to some links.
When I was doing Muaythai, I think I had strong legs, specifically the muscle responsible for stretching the leg (quadriceps?). This muscle also seemd to be bulked on the upper end of my thigh, away from the knee. The range of movement of what I did with the leg was typically very close to a stretched position. Since I started going to a gym (and doing presses with the leg with a higher range of movement), I notice that my body builds muscle nearer to my knees ( or there's a new fat-deposit) - a good thing in my book, because I hope for more stable knees.
Is my observation plausible? Can this be generalized for the training effect of movements with different ROMs?