Two tests. Counts modulo 3 are spread across all three residues (639/2063/1786),
so the u16 array is not a triangle list. And a B record is reached through a
specific cell, so a point it references should lie in that cell -- referenced
points score 0.79% against a 0.48% random-point control. Chance.
The contrast is the point. One section earlier the same u16 entries scored
18379/18379 (100%) on 'are these valid point indices'. I flagged that at the
time as the weak bound-check and recorded it as consistent rather than as a
finding. The caution was right: the powered version of the same question now
returns chance, and had the 100% been written up as the decode this page would
carry a confident false statement about MCOL's geometry.
Fifth appearance of the pattern across REGN and MCOL and the first time both
halves have been run on the same field, so the page now states it plainly: a
bound-check asks whether something could be an index, and the answer is set by
the size of the target collection rather than by the field's meaning.
Datum for the next attempt: the maximum u16 is consistently about 0.75x the
point count (923/1232, 1019/1360, 1163/1552, 59/80), too consistent to be
coincidence and not explained.
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