I'm not sure we're interpreting it the same way. Here's the game background of that 2010 Blues team. They are a 48.66, ranked only 14th in the state, 55th nationally.
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They mainly perform pretty close to that rating, with the green showing overperform, and red showing underperform. The 0-5 loss against Koge is in fact listed as underperform, but it's not by much - Koge is a 51, and the predicted estimate for that game is already a 0-3 loss.
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The clear wins the previous month you list are over pretty lowly ranked teams, which aren't even listed as overperforms because they were expected to win 5-0 and 3-0 (and actually won 6-0 and 4-0).
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There is no mystery here, and nothing abnormal to explain away. This team isn't any more helpful to the rating of an opposing team, than any other.