LOL!!!!!!!!! I rest my case you have no idea wtf a mary sue is. it doesn't matter if itachi solved problematic threats, the FACT remains, plot brought sasuke with him to help end edo tensei. that goes against mary sue codebook. "trigger sasuke to become good guy"? <<<-- so? he was also the trigger to make him a bad guy. lmao it goes hand in hand. the only thing that can change people is by confronting the very thing that changed them in the first place. psychology 101.
"praised by all" <- except just about most relevant characters have been praised alot especially uchihas. so weak point
"weakness exploited" <-

if itachi explains the (obvious) weakness, it's not a mary sue.
"considered cool and admiral" <- smh so is minato, sasuke, naruto, kakashi and gai. again, not a mary sue.
"tragic edgy backstory" <- except his backstory is sasuke's. and please, nothing was more edgy than obito's.
"over the top not seen before" <--Death reaper seal came before totsuka and shikaku came before susanoo :tea:
"outshine more relevant characters" <--Oh so I guess rock lee is mary sue too for one shotting naruto and sasuke.
You have no idea what a gary stu is and you need to take a long break from guntah assuming you're not actually him.
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