This thread is full of negative energy so I've been avoiding it but I wanted to share my results of some defoliating.
First Item in Question: Defoliating to expose light to lower bud sites. Before this experiment I would have disagreed with the "old timers" in here. Here is proof that bud sites do not need direct light. This plant was among many others in very close proximity to one another...close enough that the large upper fan leaves blocked all light from getting down below. The lowest bud sites on this plant are nearly perfectly developed. So I think this shows that bud sites do not require *direct* light
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2nd Item: I have numerous plants where I took a single node (2 bud sites) in which there were 2 fan leaves. I removed one fan leaf and monitored the growth of the two bud sites. Ultimately the results were inconclusive. Most of the plants I did this too showed no discernible difference...a few of them had a slightly larger bud on the site with the leaf and a few of them had a slightly larger bud on the site where the leaf was removed. To me, this indicates that the fan leaves serve the entire plant collectively and are not specifically for the node in which they grow. My 2 cents on the matter from *trying it*.