By disperse, I'm assuming you mean dispel? As in, send a chakra spike through my body. If so, then this feels like a completely new way of dealing with genjutsu. A completely new dimension. I'm loving it. And I'm actually just now starting to get the whole idea behind this.
That is exactly right. It isn't actually new, it's within the ancient Genjutsu Layering Rules. It just wasn't very much explored, since we didn't have many Self-Cast Genjutsu, and even less mutually Other and Self-Cast Genjutsu. This is indeed a new exploration of Genjutsu manipulation and dispelling.
Alright, since Dragy is a bit busy, allow me to explain the other three situations. They happen when consecutive genjutsu are cast upon a same target. As I said, Surreal Palm Techniques cast a Genjutsu (the same Genjutsu) on both the user and the target(s). Now, understand that, for the three situations, there is a clear distinction between Illusion, let's call it "Image" and Genjutsu, lets call it "Canvas". Illusion, or the Image, is the effect of the Genjutsu inside the target's mind, through a technique, the "Canvas".
1. McRazor's Task, which is actually the Same Rank Effect. When two Genjutsu of the same rank collide, one can't overpower the other, this means both can coexist, with the latter (the one cast last) having the ability to actually manipulate the illusion within the Genjutsu. In a sense, the latter "Image" does overpower the one prior, but the Genjutsu itself can't overpower the "Canvas". In essence, the Techniques don't neutralize each other, but one does manipulate the effects the other.
Ex: 1st Genjutsu Creates Blue Butterflies, 2nd Genjutsu Turns Butterflies Pink, turns them into Squirrels, Slashes them, Distorts them, etc.
2. Dragy's Task, which is actually the Lower Ranked Effect. This has a clear winner in terms of Image and Canvas, but retains the order of casting. As you know, you can layer a Genjutsu on top of another as long as the following Genjutsu is the same ( Same Rank Effect ) or lower ( Lower Ranked Effect ). What happens is that the latter Genjutsu can't directly manipulate the illusionary creations, the Images, of the former, but it can add to them. In essence, anything not being directly manipulated can be manipulated by the second Genjutsu. This is tricky, especially when the former Genjutsu pertains to the removal of senses, like giving Blindness, but I like to picture it as, well, Layers. The background Layer can't be manipulated, but you can add layers on top of that.
Ex: 1st Genjutsu creates birds, 2nd Genjutsu adds squirrels alongside the pre-existing birds.
Ex2: 1st Genjutsu creates blindness, 2nd Genjutsu adds birds to the blindness. You can see the bird and nothing else.
Ex3: 1st Genjutsu creates ropes to bind your body, 2nd Genjutsu makes your body longer, so it takes longer for the ropes to fulfill their purpose
3. Final situation is the Higher Ranked Effect. If the latter Genjutsu is higher ranked, stronger, than the former, then two "Canvas" can't coexist. This means one will completely dispel and erase the other Genjutsu. This differs from the other situations because it is an actual method of disrupting Genjutsu, same as Pain, Chakra Bursts, etc. The chakra of the latter Genjutsu simply purges the target from the chakra of the former Genjutsu. Only one illusion remains, and that illusion is the one that pertains to the latter Genjutsu. It's a completely new Genjutsu, in essence.
Ex: 1st Genjutsu creates birds, 2nd Genjutsu dispels the other one and creates a ponei.
Ex2: 1st Genjutsu creates pain, 2nd Genjutsu dispels the other one creates a ponei.
Ex3: 1st Genjutsu creates paralysis, 2nd Genjutsu dispels the other one creates a ponei.
This can carry on on 2 Genjutsu, 3 Genjutsu, etc etc.