Interesting, attention to detail. If we plot SUM's average price since listing over all weekly closing price data points against RYM's SP at the weekly close, the spread is identical, at 33% (top 66%, bottom 33%) currently at 47% but the trendline is steadily increasing suggesting SUM's SP performance over time vs RYM has improved and the theorem should be updated to a reversion to about 56% of RYM?
Still, it's a lot of wiggle room at 33% swing range, one could almost bet the bank on SUM not exceeding or going lower that that price range. The recent % plunge of SUM vs RYM average is quite dramatic but still only 47% of RYM, maybe quality is shining through sentiment and we're seeing where the money currently prefers to place its bets (on RYM), even though SUM is below the Couts theorem and the revised theorem (postulated) at 56%?
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