Well this is a general misconception.
Naruto is above Minato....however, he most likely is not above EDO MINATO. This is because now Minato is immortal with infinite chakra as well as has access to chakra he sealed in himself....not quite the same.
And yet there is still one small sliver of hope. The last chapter confirmed that Minato's space time barrier requires one to send the Target to a Kunai...therefore if Naruto uses a continuous Bijuudama, Minato has to either retreat, speed out of the way (less likely), or hopefully not run out of marked Kunai.
But YeH, Naruto > Minato....bit for the most part it is a struggle to deal with his Edo Father.