well, there are small leaves on the buds that also help in photosynthesis, but you should look at the leaves as solar panels, the higher power panels need more surface area, to capture more light energy, so most of the photosynthesis occurs in those big fan leaves surrounding your plant's stems. also, one thing i noticed, is that buds that grow tall and closest to the light, will have their trichomes damaged from the high light intensity at this distance. it is more important to have your leaves rather than buds, under direct light.
i think that popcorn bud should avoided as much as possible, as they are consumed quickly, have little real weight in them, but I was never able yet to flower a grow with no popcorn buds at all. it is of course too late now to trim your plants.