Hmmm. So my UConn playing UConn hypothetical was taken literally. OK then, here's a more logical approach. If out of all the allegedly great players only one had a subpar game against UConn, or 2, or 3, etc, while the others played up to the competition in their greatness, then it would be logical to conclude that those few "great players" who came up short were not so great after all.
If out of all the allegedly great players ALL had a subpar game against UConn, or all but 1 or 2, then it would be logical to conclude that some of the others still might be great after all, but UConn's team defense is so good that it's useless as a measuring stick for comparison. When not only Diggins and Thomas, but also Lucas only shoots well in the last minutes, Ogwumike is turned into a volume shooter as a post player and Griner is shut down for a half ... subpar games for all of them ... perhaps, just perhaps, performance against UConn no longer becomes a good measuring stick for comparison. Some may not be great, but the measure would be subpar performances in other big games besides UConn.
What percentage of great players having subpar performances would you need to conclude which scenario best fits UConn? That is the point at where people can disagree, but the logic I've presented for making that distinction is sound. It seems to me that the number of players who have played "up to the competition" when that competition is UConn is better measured over a decade than a year, and never involves the opponents "best" player that draws our focus. Our defense has been that good.