"Yeah you did." Though the weaknesses are new. Seems that means Minato is weak to Arsene. He's not sure how to feel about that.

"Bless and Curse. Bless is light element and Curse is darkness element. Arsene's element was Curse."

Thus the weakness to Bless. Though Ren hasn't been able to figure out why Arsene is weak to Ice. Maybe it had something to do with the stories with Arsene in it?