I continued digging and this one from 2015 appears to corroborate everything I've seen.
ADDM: In the Discovery Access, why are some IP's skipped with an End State of Opt1stScan or OptNotBestIP?
The term "best IP" is somewhat misleading. If a device has, for example, 3 interfaces, ADDM will label whichever one it processes first as the "best" IP. When the scan then processes the other IPs and determines they are for the same device, they are labelled "not best IP". It's not possible to configure which IP ADDM will choose.
So I may have found the documentation I needed but I would appreciate confirmation or any other documentation references.
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best_ip_score is not very enlightening.
The best IP has several factors involved:
* which IP is scanned first,
* which access methods are available on the IP, for example ssh is considered better than SNMP,
* if the device is managed, for example a vCenter managing the device is better than scanning the device itself, and
* IPs recognised as virtual are considered as worse than others (best_ip_score).