This is where i must respectfully disagree with you theman, a first i believe lol. For it is the leaves that store those unused nutrients, it is my understanding that the nutrients that reach the buds are turned into sugars etc, by the time they teach the actual flower. I could be wrong, as almost nothing i say can ever be certain haha.
I however have experimented with this the last year, with the help of patients and they came to the same conclusion. The experimemt was with two crops, same strains, one recieved flush, the other not. All other parameters were the same. After roughly two-three weeks bds from both batches burned smooth and clean. There is however one more variable that is not accounted for, as you mentioned-some nutrients/ ompounde may act differently in the photosynthesis process, thus leaving nastys in the buds regardless of process used. Just a humble mana thesis, based on limited scientific knowledge and in field experience.