Sorry if I misunderstood.. but what good would a spinning, or spinning jump kicks if your opponent is on the ground.. that would be the ideal time to flee, or get in good mount and start taking him out. I think spinning kicks are impractical for most, because it's tough to be able to do them quickly and accurately enough for them to be of any use. I don't consider myself great at them, but I've used them in kumite fairly often, I use a lot of legs. Anyway, a guy I knew could do a spinning jump kick extremely quickly, accurately, powerfully and with lots of height.. for him, and those who are quick like him, it could possibly have practical use. just my 2 cents