I guess I didn't understand the point because while the inverse jugs/quarts relationship may be true for some (eg QS) oils now, it is not and has not been traditionally true for others.
Examples, until relatively recently Mobil Clean 5000 always had the lowest jug price @ $11.00 and the lowest quart price @~ $2.57. The next lowest was MC Syn Blend 5w20 jug @~11.50 and qts. @~$2.77. And Wally's Super Tech has genarally been the lowest of both, but it's not name brand.
In my area Pennzoil conventional, Havoline and Castrol are all $11.50 (same as MC blend), but all of them were higher and have come down relatively recently, Castrol being the lastest. So it appears they have come down to the MC price. Truthfully I pay little attention to the small difference in the quart prices, as they rarely (if ever) come down in price and as a rule I don't buy them.
What I can say with confidence is, as opposed to the quarts, Wally has traditionally been willing to mark down the 5 qt jugs to a competing price point. IMO, irrespective of the qts. price, that's what's going on now. And, it is only within the last year that QS has made the marked move down to ~$9.50 or less a jug. It's also one of the reasons I am running QS in my cars now after not using it for years.