Minato has originality. FTG is specialty. Along with that he knows sealing jutsus and is very versatile. He is also exceptionally talented with chakra manipulation and conversion.His Sage Mode wasn't perfect, he said so himself he couldn't use it in battle, he didn't even use it against Obito. What's worse is the toads never mentioned him when Naruto achieved a higher level of SM than Jiraiya which suggest it was also an asspull power up made by Kishi.
Finally, using Sage Mode is nowhere near the same as containing the most powerful bijuu, Kurama's chakra volume is thousands of times more than what Minato can produce with NE.
Furthermore, Kushina said the Jinchuuriki for the 9tails were chosen for their special chakra, as a non-Uzumaki Minato doesn't meet the requirements to be he 9 tails host.
He was physically overwhelmed from having a bijuu inside him, there's no way he would be able to use KCM with a living body.
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True, Kishi made it look like Naruto's talent with biju chakra came from Minato when in reality it came from Kushina. It would've been more believable if she was able to use KCM instead of him.
I wanted him to use more original techs like FTG and sealing jutsu or some of Jiraiya's abilities, the DBZ style look didn't suit him at all.
The only unoriginal thing he did was use BM.
Everyone current character in NV is using a move someone else already has except Naruto/Sasuke.