The reason Sasuke used Mangekyou sharingan instead of eternal:

[Amaterasuice]

The reason Sasuke showed his ms here,

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Was because Kishi was proving to us we haven't seen all Ems could do. Image not working: It's chapter 620 page 1.

It was also proving that Sasuke held back more than even Itachi versus Kabuto, here:

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Now, his real ems powers started here:

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So we truly don't know what his real ems powers are. (Which was kind of obvious, but Itachi fans are saying that Itachi>>Ems Sasuke still. No, it's edo Itachi>>Ms Sasuke. And Edo Itachi ??? Sasuke).

 

[-immortal-]

what.. Sasuke used MS because of this

 

[GenKiDama]

just because he has ms activated doesn't mean hes going to use his eye jutsus, which is the same deal for ems, so that doesn't explain everything

 

[TheCCV]

So you're saying he doesn't need EMS because we don't know what the abilities are? Weak arguement.

 

[Itachi Rane]

dude...i honestly don't believe that EMS grants the user any special powers other than eternal light. MS and EMS of the same user have same powers because even if the EMS eyes of sasuke belong to itachi, it is sasuke's chakra coil that connects those eyes with his mind.....so other than eternal light i don't think sasuke has other hidden powers.

 

[blackstar9]

Ems sasuke over itachi that should be obvious. Not sure why he didn't show his ems

 

[Ishan Hokage]

Sooo Sasuke doesn't use EMS because he doesn't want readers to see his abilities?

 

[blackstar9]

dude...i honestly don't believe that EMS grants the user any special powers other than eternal light. MS and EMS of the same user have same powers because even if the EMS eyes of sasuke belong to itachi, it is sasuke's chakra coil that connects those eyes with his mind.....so other than eternal light i don't think sasuke has other hidden powers.

We haven't seen much of ems sasuke. But I'm sure ms sasuke susanoo didn't have ametarasu orb or sword

 

[Gary777]

We did not c much of totsuka also ... Sasuke is strong though no doubt ..dat doesnt mean itachi is wweak

 

[Psyduck]

Are you talking about the debate over why Sasuke showed the 4 Homage his standard MS, and not his EMS? If so, then everybody isn't understanding at all.

I believe he showed the Kage the MS to possible save some energy, or just to keep an ace in the hole, or trump card. I don't know if it's true, but it may take extra energy to switch to EMS. That's the most unlikely explanation, but it is still plausible.

I'm leaning towards the ace in the hole theory. When he got there, he hasn't made up his mind of what he was going to do after getting answers. Maybe he downplayed his own abilities in the event of having to fight, or show force. Keep the enemy underestimating his abilities.

 

[Psyduck]

Sooo Sasuke doesn't use EMS because he doesn't want readers to see his abilities?

This is the worst misunderstanding I've seen in a LONG time. He means that Kishimoto may have purposely shown MS to create suspense amongst the fans. Which is working, clearly. No, he didn't make Sasuke break the 4th wall, as you seem to think he said. It's a story, literature like any other. There are many ways to create suspense, interest, and debate. Which is happening right now. Kishi meant to leave it open. So we can all talk about it, and make theory's. He has to do something to keep fans interested.