The same reason why Danzo could use Shisui MS ability once a day rather than a decade, SENJU Cells. Tobi claimed to have them and they enhance sharingans in some type of way. Maybe with the cells he doesn't even need to awaken MS or EMS to use his s/t jutsu , It adds up.. just my theory.
Edit: Made a mistake once a day he can use the KA but still a big jump from normally once a decade.
Edit: Made a mistake once a day he can use the KA but still a big jump from normally once a decade.
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