I wasn't aware that Ryuuji gave the reanimation technique's blueprints to you, Kamui. But since Ryuuji was your neo subordinate for quite some time, I suppose I missed something.
Were you part of the cult? Are there records of you using Edo Tensei? When?
That aside, I do like to mention that Edo Tensei was downgraded in power. If you have records of using Edo Tensei, then, by all means, use the technique. Just know it's not as free.
MI: Aside from you, Kamui, I also obtained the eternal mangekyou sharingan through traditional means. It's quite true. Now that I'm thinking more about it, I got a hint on how to obtain it through you. I don't know if you can recall, but we crossed paths long ago... During the time Ryuuji's Guntai was in war with Neo, you carelessly rp'd through Madara, your previous account, before me and my partner in the zones.
You rp'd your way in, and introduced yourself before us, saying, "Nice eyes (I was known as Uchiha back then)." Of course, Madara, your account, was the one who chattered away and hinted that hatred was the the key to upgrading my eyes. At that time, I had Mangekyou sharingans.
And so... I killed Joker, my Uchiha brother, took his eyes, and implant them to mine a year later.
I have no clue on how others obtained their Eternal Mangekyou Sharingans, but I'm not relinquishing mine.
Edit: I'll post the rules of Edo Tensei tomorrow. It's somewhere on my computer.