Guys, let's think real carefully about this. Do we really want any scrub to have the ability to claim the following, and use them all in unison?
Body-Splitting Technique
Dust Release
Earth Grudge Fear
Flight Technique
Flying Thunder God Technique
Healing Power
Jashinistic Immortality
Mind's Eye of the Kagura
Summoning: Impure World Reincarnation
When I say any scrub, I'm talking about the average person who comes around to start as a Chunin or Jounin and then automatically be able to use all these techniques? Sure you can call them out on some chakra usage, but it takes only one scrub to create a chain reaction of other scrubs coming about and using them too.
And before you try to call out Bocc as a reason, I'll have to remind you guys that he's worked for a lot of these here and there, and built up a large enough chakra capacity to utilize some of these techniques. Same as any other strong and notable people.
Now if we're talking about inactive claims, we also have to talk about what is considered "inactive". Are we talking about logging-in inactive, or RP-active? Either way, Yūmei has been active in both in some way, shape or form. If you really want an already-claimed technique, you would go about and either challenge them for it (which they can deny) or go find them in RP. Or you can make up your own original techniques, so long as they make sense.