It doesn’t seem like you’re trying to understand the metric. The basic idea is that it assesses the quality of a team’s wins, rather than the quality of a team’s performance, which is what predictive metrics like Ken Pomeroy’s rankings do. The baseline is what a a hypothetical average bubble team would do. I think we all understand that a road win against Kansas means a whole more than a home win against New Haven; this is just one way to quantify it. According to this, an average bubble team would have had a 13% chance to win at Kansas. Our win there counts as 0.87 WAB. An average bubble team would have had a 99% chance at beating New Haven, so our win was 0.01 WAB.
Now, one could quibble with the probabilities, or with the definition of an average bubble team. To me, this is better than the quad system which is a bit arbitrary and is less precise in measuring the quality of a win.
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