Rotor replacement

A local mechanic/shop teacher told me that because the hub and new rotor are two pieces bound together I will have to get the new rotors cut to make sure that they are aligned (in plane) with the hub. Otherwise they could be too much runout and I'll get vibrating. What do you think about this.
Nope.
Don't believe in that mans theory.
Many times in years gone by, i have sold complete, 100% all there, nothing missing, these 65-72 Kelsey Hayes disc brake systems to members on this forum.
Many times with new rotors onto the hubs.
Nobody has ever gotten back with me, stating they ever had any kind of problems with my rebuilds.

Kelsey Hayes A Body Brakes 2014 010 (Copy).JPG