you cant say for 100% that minato would be a push over and im pretty sure minato could discipline naruto and the reason naruto took longer was because he had a lack of concentration from goofing of as that was his way of getting acknowledged but in the end of the day it is all speculations to what naruto may be but i believe he would be completely different to what he is nowMinato is to timid to control naruto/ Kushina's personality so naruto would still be the same... And I naruto would still have his same progress cuz u see how long jiraiya took to teach naruto just how to use basic taijutsu and defend against it, genjutsu awareness ect. I just think he would have different skill sets at the same age as now, probably same ninja rank cuz it is called "naruto" lol