Its uchihas KKG to turn regular eyes into sharingan not any1 else. Kakashi couldnt awaken MS
But Kakashi not turning Obito's regular eye to the Sharingan, it's always active and goes to MS. If Kakashi can activate MS from 3 tomoes then why can't he awaken it? There were no chakra from Obito's brain flowing into Kakashi's Sharingan but both Kakashi and Obito saw someone they cared about died, we even see Kakashi crying as it happens. They eye might have been connected by that doesn't connect their chakra.
Obito saw Rin die
Non-uchiha's can't awaken the MS
It's genetics...
If that was true then Kakashi shouldn't be able to go from 3 Tomoes to MS on his own either since it's chakra from the brain that does that. I believe non-Uchihas can awaken the MS only if they already have the 3 tomoes and experience the required pain. Both Kakashi and Obito were feeling the pain of losing someone, Kakashi was even crying.
Actually sasuke awakened his magekyo right when itachi died. Notice the blood leaking out of sasuke's eye, and the deliberate scene focus on his mouth.
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That wasn't the MS, that was blood that ran from his forehead to his eyes which are normal. He would have to be using Amaterasu to have his eye bleed like that with the MS.
Nagato can use Rinnegan techniques and he didn't awaken them. :|
Well the Rinnegan is how Nagato got the eyes, he couldn't deactivate it to EMS, MS or 3 tomoes. Kakashi on the other hand stays in 3 tomoes and he can freely go from 3 tomoes to MS. He shouldn't be able to since it takes chakra to do so, so how can he activate MS without having Uchiha's special chakra? The eyes being connected wouldn't put Obito's chakra into Kakashi's to make it go MS.