I'm no fancy stats guru, but if I understand correctly, xGA and xGF are "expected" goals based on the quality of shots. So, it shouldn't be considered a good thing if your expected goals against are among the best in the league but your actual goals against are among the worst.
At least if both are bad, you could theoretically improve the expected goals against and your actual goals against should drop. If you're already keeping the quality of shots low and still bottom 5 in the league in GAA, there's no room for improvement and what happens when the other teams start getting higher quality shots?
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