installed new $300 caliper, everything perfect, no noise, no heat.
Pulled other rear wheel caliper off, pads not nearly (maybe about 1/2) as worn, (so I have been dragging for while). Maybe more important the pins were in almost perfect condition compared to apposing side.(all pins were cleaned last year).
My conclusion is that the grinding noise that made me look for an issue was probably just a stone or freak occurrence. I think the pins supplied with the rebuilt were inferior which caused this rotor to drag. I probably should have first cleaned up/replaced pins before jumping into a new rotor, But I am a worrier and it would have always been on my mind that I could not trust that rotor.
used right rear rotor for sale?
TAHNKS for all the help and feedback!