"its root creator will always be a flawed human"
"But since a human can never create AI to create AI better than a human..."
This is your premise. I don't think, and a lot of smart people don't think, this is true. The thing that gets people really worried or excited is that they think it IS possible to make an AI that can create better AI. And it's a positive feedback loop that goes nobody knows how far.
There is no reason, unless you believe in magic, to think AI can't be as smart as humans. But if you go that far, there's no reason to think it can't be smarter. And if it can do that, it can make better AI than humans can.