While it's cool to see Kuro's body, I don't know if I would have liked to see him come back, despite how much I like him. The fun part would be, if he comes back to life, to see everyone else's reaction.
Besides that, I wonder about that comment about wiping the slate clean, is that why Juro took out one of the elders? to make way for a new generation, the Kumogakure are clones of who, exactly? Koji Kashin, someone we haven't met, maybe?
Also, is Shimada the rat then? as someone from the foreign department, was he condicting experiments on people outside of japan to gather more power, like in a invulnerable ninja like dom, for example?