From Unofficial Zero Manual
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Some general speculation here about how the BMS is designed and arranged, correlated with BMS board examination.

TI PL536
Stackable Cell Monitor With Overvoltage Protector and Balancing
The product identifier "PL536" occurs in BMS logs, referring to a TI BMS chip that handles 3-6 cells in series.
The Zero BMS has 5 of these (visible on the front of the board above).
The 5 chips divide up the 28 cell series into groups that each chip monitors (seemingly 6 per chip until the last chip handles 4 for a total of 28).
BMS tutorial
BMS on wikipedia