we know nurk lost a step, but if he can get that back (which im not sure he can), keep in mind that frank vogel is defensive specialist, so hed likely to a better job than terry stotts or chauncey billups did
that being said, im not sure if phx has defensive minded players, they seem like all-offense team with kd, book & beal, try to outscore everyone
if you disregard the contract, you trade nurk for ayton without any doubt (if it was pre leg-break nurk, then its a different story, but sadly, its not)