I honestly don’t think it’s all that far out there to say that Geno would be historically bad at SS. He wasn’t good there before, he might not even be a good 3B at this point. I don’t think it’s at all outside the range of realistic possibilities that could happen.
And I think a really good team could absorb historically bad defense at SS, like a division winner 100 win kinda team. The Reds aren’t that good.