Board Thread:Theories and Speculation/@comment-30323490-20170305205254/@comment-30323490-20170306182212

LegionZero wrote: EMS doesn't just fix blindness, it amps up the users power. Sasuke activated MS after he lost Orochimaru's power, so they didny do much for his MS, it was immense grief after learning Itachi was actually a good guy that activated it.

Naruto being a Jin pretty much automatically disqualifies him since we have never ever seen him without Kuramas benefits. Idk why we are talking about them.

Pre-Kurama Kushina must have been a beast considering she could hold back Kurama within a few hours of extraction. The fact that she could hold back a tailed beast at all on her own is impressive.

Oh and 3rd Raikage outright brawling with the 8-tails.

Yes it does.It was stated multiple times that the mangekyo sharingan produces blindes.During his fight with Sasuke, Itachi himself said that in time the mangekyo loses their light.Also, Sasuke started to lose sight after his encounters with Danzo and Naruto and was fine after he got Itachi's eyes.The same thing probably happend with Madara and Izuna.