No one shoe is going to be perfect for everybody. The method of sizing shoes just with a length and width does not account for the variablity in the height of arches, height and shape of the top of the foot, and that some feet have a fan or hourglass imprint.
Tennis shoes don't come in different models for under and over pronators like running shoes do. But under pronators will be happier in a shoe with a relatively flexible sole like the Gel Res 2, while over pronators will likely do better in a shoe with a stiffer sole like the Barricades.
And some shoes are just going to accomadate individual prosthetics better than others.