Why does the copy sound better than the original

OK, Nespa light treatment, Intelligent Chip, Audio Deske edge beveler, Cream Electret, Red X Pen, if ya wanna get all esoteric Like. I'm also a big fan of scattered laser light absorbers, cryogenics, CD fluids like Liquid Resolution, demagnetizers, ionizers, black pen for inner edge...you know, anything to give me an edge.

CD is a dinosaur. Get a hard drive.

There was an issue in TAS where Peter McGrath, engineer for Wilson recordings, heard a copy of the CD and it sounded better. I believe the word he uttered was "impossible!"

As it turned out (on CD at least), the CD-R/RW pits are wider than the commercial CD pits, and so the copy is cleaner, and sounds better than the original. Robert Harley also commented on this phenomenon in the pages of TAS 3 or 4 years ago when it was discovered that it was the blank discs that were responsible for the better sound.

Gbmcleod wrote,

"As it turned out (on CD at least), the CD-R/RW pits are wider than the commercial CD pits, and so the copy is cleaner, and sounds better than the original'"

That's weird. The pits are narrower on Blu Ray discs and Blu Rays sound better than either CD or CD-R. Wassup with that?

Good question, and I'm no expert on that one!
It would seem the practical course of action is to email either Peter McGrath or Robert Harley, and find out if there's been an exploration of why this happens, along with whatever limitations (exclusions) they've come across.