Its quite possible for a cola to only get partially seeded, I saw that with several of my pollinated buds. They became pollinated only where pollen lands, so a couple of seeds grew out of otherwise fine female buds, e.g. a few seeds in otherwise fine colas, a bit further away and lots of seeds in colas that got misted with pollen that were close up.

I think thc may go down, but you'll still get bud if you're diligent.