Quote Originally Posted by DarthEnder
I also thought it was pretty funny that they have the corpse of a guy who could make himself immortal and use multiple hearts and the only information they are getting from his corpse is "what Naruto did to him".

Tsunade should be discovering the secret of heart transplant surgery now.
That's like saying you would know how to reproduce the sharingan by analyzing a uchiha's corpse.

I'm sure such a jutsu has certain countermeasures that prevent enemy nations from properly reproducing it.