Originally Posted by kael03
"Doryuku" means "eye power". Tobi was referring to Danzo deciding whether or not he wants to use Kotoamatsukami or Izanagi. Hence the part of "use it as a genjutsu or throw it away like Izanagi".
Maybe im wrong but I think when he said Doryuku he was referring to what Danzo had just done, the manga focused on sasuke coming at him, showed a close up of his sharingan and then next panel sasuke has barely moved and Danzo is all the way by Karin. It appeared to be an ability from his sharingan hence why I said space time ninjutsu.