Gotcha, thank you for the LM<->VC interchange, I see how the VM registration is different from VM power-on.
Datastore presentation doesn't appear to have changed; I checked up on the EVA and it seems healthy.
I don't see any event logs from this timeframe when checking the server management (OA/iLO)
I've got a request out to our lab team to check on SAN logs for this machine.
Unfortunately, I wonder if the problem may have 'gone away' (I need to give it a few more days), as all the VMs that are currently deployed on the machine have arrived since Dec8th AM. The most recent registration failure was 2am on Dec7.
I've marked the thread answered, as I appreciate the help/tips! I'll reply back if we find anything good in the SAN logs.