No, Kamui taught Hazama, and had Kyu pirated it from him.
Tsuyo----Trev
Kyu-----Hazama (Incapacitated)
I believe Shinro says he just claimed it himself, or something. A long time ago, and Ryuji is gone. So Shinro, is open to teach.
Former members: Bocchiere, Kamui. Both had it pirated, thus cannot use Edo Tensei anymore. Though regarding this, I did have a note. Should we from this point onward, consider anyone that dies, as losing Edo Tensei?
I bring this up, as say I die in battle. With me dead, Tsuyo decides to teach someone, since a slot opened up. But, what if I get brought back to life? Would I still fall into that role, or start my own, etc. This is why I think once you die, starting now, even if you get brought back, you forget Edo Tensei. So, kinda what Zojin was getting at, I think.
As for what has be discussed, these are the listed rules, once more.
- Limit Edo Tensei to only 3 summonings per battle
- Only one Edo Summoning can be used per bijuu battle
- 15% of chakra should be the cost for each summoning and permanently lost for the duration that the Edo is active. So summoning the max of 3 zombies equals a loss of 45% of the summoner's total chakra pool. Only when an Edo is sealed or un-summoned is when the user can start recovering the lost 15% for that summon.
- Regeneration Rule
- As long as Edo Tensei is being used, the user can only use defensive moves. And these defensive moves can't be used in the motions of an attack.
- Alts & NPCs are not allowed to become Edo Tensei. You also can't trade alts with a friend for Edo Tensei zombies. (If you can't trade sharingan eyes with friends anymore for the EMS you shouldn't be able to to trade Alts with friends to create mutual Edo Tensei.)
- 1:1 Ratio rule. You can only summon as many Edo Tensei as there are opponents. 3 is the max.
- Teacher-Student rule.
- They cannot host biju
Things being debated are, Should Edos be allowed to use Shadow Clones, Edos shouldn't be allowed to use the Chakra Transfer Technique, whether released Edos should still subtract chakra from the summoner, and Kage suggest a control rule and making the summoning fee 25%.