Plumlee and Nurk are vastly different. Plumlee would have been solid in Vogel's schemes because he's an athletic big that plays within 10 feet of the basket. He's like a poor man's JaVale McGee. That isn't Nurk, never has been. While I like Plumlee as a backup here he's an odd fit for Coach Bud's offense. Nurk is a poor man's Jokic, can pass and play the post while being a beast on the boards but that's about it.
Frank is more of a Bud style Center and does play more like Nurk on offense but he's a bad screen setter and afraid of hard contact and getting physical. That's not Nurk or Plumlee.
The 3 Centers we have are quite different though so really don't understand how you are getting the idea we brought in backups who play the same as Nurk.