Board Thread:Versus Debates/@comment-46441687-20200805182809/@comment-26636534-20200819181857

Yeah, ch412 is where Fukasaku states only those with "enormous amounts of chakra" can learn toad sage mode. And cites Jiraiya and Naruto as examples, of which Minato would be the third example as well. So by having SM, Minato by default has "enormous amounts of chakra". And from Fukasaku's comparison, Minato probably has tailed beasts levels of chakra.