You're right...about Sasuke awakening MS...at least I think...let me research it and get back to you on that....but he was given EMS....Itachi could've easily killed him....Sasuke was out of chakra and techniques...Itachi still had Susanoo that he used to survive Kirin.....Itachi died due his illness,Itachi knew it, ultimately Sasuke was given his eyes.....
Sasuke wasn't given his eyes..
He had to fight for it.. Even if itachi went easy or not
Sasuke still had to be on a certain level to survive in that fight.. to break tsukyomi on his own, dodging amaterasu.. these were all risks in this fight..
Itachi even thought sasuke actually died when he got hit with amaterasu.. you could see the disappointment on his face.. He took off amaterasu immediately...
zetsu asked why, and the other half said " he's probably trying to preserve the eyes"
NOPE, you could see on his face he thought he killed his brother