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Fanboy detected.
Sorry man, but Sasuke is already OP with his EMS, which by the way is not his own, so having Naruto getting help from Kurama seems only logical; think about it, if Sasuke has Itachi's eyes, therefore Itachi's help, why shouldn't Naruto have Kurama's help?
Plus it is Naruto's power and strength that allowed him to keep Kurama under control, and lately Naruto's actions that made Kurama acknowledge Naruto, thus allowing Naruto to have full access to Kurama's powers.
Now if you just can not accept Naruto having so much power, then sorry mate, but this is your problem alone, yet you need to realize that Sasuke is already way to OP, so yeah. Just deal with it that Sasuke is not the god of Narutoverse, the only god was the Rikudo Sennin, aka the Sage of Six Paths.
One more thing, the manga is called Naruto for a reason.
And last but not least, there is never only one side to the truth since your last comment was something really stupid.
Thank you and have a good day.