UB What do you mean about the last output to occur at the lowest node? Im not sure what that output means.

Also, why is the reason we wait until there are 5-6 nodes, and just cut the second one? Arnt we throwing away alot of wasted plant material? Maybe a weeks worth of growth? Also, we could root that top, and do it all over again right?

Lastly, what would be the advantage of having 2 main colas rather than 4? Why not just go 4 colas all the time, doesn't that mean more production? That also means no more topping the plant anymore, right?