What an absolute treasure house! Thank you SO much for taking the time to get all this down. I’ll work through it and see what I can replicate/fix.
More importantly, from the point of view of this thread’s favorite recurring discussion topic: congratulations on being (if I’m not forgetting anybody) the first players to notice and report the flanking forces evidence. 
By the time I wrote Ch 4, there had always been abundant ways to rid yourself of Breden. The Bethune Anomaly is not left over from an earlier version, nor an oversight.