Board Thread:Versus Debates/@comment-46441687-20200805182809/@comment-31715856-20200806193440

Ay clearly states Minato was superior to him (which was obvious from the fact he could take on both Ay and Bee at the same time). Also, it's highly likely Rasengan could break through the Lightning Armor (and/or Minato could chakra flow Wind). Ay doesn't have as inherently tough skin as his father, and Minato already had large Rasengan as his base Rasengan. This is answered in the series itself.