I’m with him on this. I am guessing the difference after breakin will be unnoticeably small.
One of my jumpers came off my speakers so I only one woofer was working on one side and two on the other. It slowly dawned on me over a couple hours of listening that my system was bass shy, but not that there was a woofer problem. I decided to move them back to reinforce the bass and found the offending wire. Very different, but small channel differences are not really appearing.