Hmmm... well that crushes all the "Obito is still alive" and "leader of Akatsuki" theories. Rin must be a damned good medical specialist to transplant something like an eye that quickly. Must have been insanely fast because the Stone-nin was still standing there, you'd think he'd leave fairly quickly if he thinks they're all dead.
And I wonder how the eye will somehow progress to 3 commas? I would have thought it would be impossible to actually improve/upgrade the eye once it's been implanted.
This one chapter answers so many questions - and presents new ones too. I love it.