this is my personal experience, removing the lower bud sites, when people think they are actually losing precious bud, its really just allowing the upper actual colas at the canopy (where the light is the most intense) to use the energy that they are using on dying lower junk, to produce larger denser colas. so instead of giving you 15 sites (half of which will dry to about the size of you thumb nail) of airy buds you will have 4 nice, thick, heavy, rock hard colas even on my smallest plants (24") have produced dense ass colas. even below the actual cola where usually i would get little airy buds anyway where fat and dense here is a pic of my smallest branch and you can see even below the top cola they are huge.