until proven otherwise, there's only a slight implication that minato has sm. treating it as a tool in the fight when we neither know whether he has it or not, or to what extent he can use it is idiotic.
edit: apologies to the OP, i posted while assuming that you were saying minato has sm. anyway, minato if he had sm definitely did not master it to the extent that naruto did, or perhaps even jiraiya.
anyway, Minato>>>Sm Naruto (when he fought pain). If he can merga with the sages now, then Naruto wins this