
Originally Posted by
Afro Thunda
Well, Kabuto did say it wasn't particularly easy to find the DNA of some of the people he summoned. There's no telling how long it took him to amass his zombie army, and that's the one detail we don't know. I'm sure it took him a hell of a long time. Though he might have gotten a head start working under Orochimaru. And considering that he worked with Orochimaru, I'd say his scavenging and information gathering skills are top-tier, so aside from obvious clues, he probably had a very good idea of where to look for bodies and whatnot. Though it may still seem convenient that he acquired as much as he did, we shouldn't assume that it was just a cakewalk for Kabuto to find all that he needed
The DNA acts like a summoning contract for the souls. That's how the soul gets called back. After all, Kabuto did say that the Edo Tensei was a variation of the summoning technique.
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