Just for clarity here Jax, of the six racks tested, three came pre-constructed and involved little alteration before the test, while the other three arrived here flatpacked and were constructed completely beforehand.
They weren't positioned differently - each was tested in the same position as it's predecessor using the same equipment, tracks, and quite possibly the dust particles in the air - although most likely in a totally different order. It is entirely possible that a storm of mutant dust particles could have sent our collective cochleas out of kilter, but without the aid of an aural inspection, we'll take it as read that they're all working fine.
So let's just go over your rarity once again, for those who may have missed it...
* No difference in positioning
* Six identical set ups used in test
* No significant time gap between tests - a minute or so to move equipment across, sit on sofa, sip coffee, read War and Peace etc etc
* Acoustically neutral (and certified so) room used
To my eyes that's not so much rare as overcooked.
When Joe meant 'side by side' he meant in the same test - not literally side by side a la Johnny Marr's four Fender Twins during the recording of 'How Soon Is Now?', he was, in fact, using a figure of speech. So, to avoid such confusion, let's sum up what he meant -> You're wrong.