OK, my observation is the fish is most attracted by the fall no matter how that fall occurs as long as it's slow. I use added weight only to overcome line surface tension, wind, current, and line floatation (I use braid).
As far a what natual fall really is in relation to a real worm, they move around a lot when put in water, so if you want to imitate natural, that is what natural does. Un-natural would be a even/level/rapid fall as would happen with the subject hook.
I choose a "natural fall" for my presentation, the fish like it.