I really wouldn't expect this unnamed community to have any sensibility when picking future opponents. They also were fervent that Sanji would help fight Katakuri due to FS and Sanji specializing in CoO.
We are here to wank Kizaru and he is in my top 3 favorite character but I don't really think Kiz is stronger than Mihawk. I see them around the same level with maybe Mihawk extreme diffing in a fair 1 vs 1.
But I think Kizaru will surprise us later down in the story so we never know, I think he will be involved in Vegapunk arc and things will be crazy. Kizaru for smartest guy in North blue, and smartest guy after Vegapunk with Beckman !