the bottom line is this, like I stated above, when you've got lots of seeds, that really when it takes the power away from the THC, it doesn't matter how dank the bud is, or how well you grow it, if it's got too many seeds in it (more than a few in the very bottoms) then your going to have much less potency.
You can have big fat smelly dank buds above, with no seeds in them whatsoever, and the ones below with buds in them, will be of "lesser" quality... In my experience, that's about how it works.
If you look closely at a bud with seeds in it, it's made differently, and if it's got a lot of seeds, it's almost 2/3 seed weight, that's 66% of everything, minus the stem, leaf and THC...
It looks to me it's almost a density thing, there seems to be more hairs per/sq inch in some than others... Although, a post inspection like this is very biased and unscientific, it's would need some validation. Doing it under controlled conditions, to be sure.