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He used it but couldn't keep it active for more than a second. Jiraiya could have taught it to him. That page only states that Minato couldn't master it which could be a matter of lacking the talent for nature transformation. Rather than not having enough chakra for RS.

I asked you because I was too lazy to check. Minato only has one "asspull" (strange name to give the term. Wonder who thought of it and why). That being KCM. Him knowing SM makes sense. Albeit it wasn't said that he could do it earlier, but likewise, it was never said that he couldn't.

Minato created Rasengan & was in the process of RasenShuriken. The others were taught it. Experience has bearing on age. Aswell as innate ability. RS requires massive chakra that Kakashi doesn't have. Was it said that he couldn't even make a wind Rasengan?

Minato died young. Given more time he would of had it done. And Nruto was just now learning wind style. Whereas Boruto was already experienced with it.