If either of you paid attention instead of jumping in with both feet assuming you know what you are talking about you would understand I have NOT topped my plants, I have removed the apical tip which is something entirely different.
Topping is a technique that forces the plant into producing multiple main stems all showing apical dominance.
I have removed the apical tip in late veg so the plant no longer has a "highest point" thus distributing the indole-3-acetic-acid (IAA) auxin evenly across the plant.
The main bud on this plant is NOT that size because it's closer to the light source,it's because that's where the most amount of IAA is produced (in the apical tip).
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If I remove that apical tip bud altogether then you will see that the now top buds are all pretty much the same size.
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(This is the same shape that my plants are now,before flowering.)
Because the plant doesn't have an apical tip it CAN'T have a single main bud, thus making ALL the top tips the main ones producing an equal amount of IAA and yield buds of an equal size.
It's a very simple concept that has been scientifically proven over 70 years ago, I can't explain it any simpler and if you don't understand it now you never will.