thanks ptsenter -- looks like /system/esi/bin/start_epd.sh is what loads the e-ink related modules. and it does make sure to explicitly call /system/esi/bin/busybox for the purpose. so it may not have been the alternate busybox in xbin causing the problem, but still not sure.
wish I had done some more digging instead of being panicked and simply wanting to restore everything ;-)
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