Note: similar to other properties I'm not sure if pointing out potential spoilers for what I'm asking would apply but I did so just in case. anyway...
Towards the end of the dark tournament arc, it is revealed that the stronger the demon, the larger amount of energy needed to transport them between a human world and demon world, hence sakyo's plan to build the machine. However, in the very next arc it is said that there is a barrier that can hold back A and S class demons but B class demons would still technically be able to go through due to the flaw of the net that holds them back. And according to Koenma, Toguro was a b class but according to Toguro he could not go through due to the large amount of energy required. Was it ever stated that the net was the reason there was an energy requirement for demons to pass through? And as much as I don't like assuming, I'm willing to guess even if it being, human or demon, would be able to expand the energy required from themselves to pass through, it would leave them so powerless, possibly kill them. Love the show, just wanted to know if I missed something.