Looks like the issue is in the vCenter Inventory Service not starting up properly. I shut it down, unregistered it from the host it was on, verified it was not registered on the old cluster, and started it up on another host in the new cluster and watched it boot.
When it came up, It started the Inventory Service, but failed to register itself.
InventoryService ready after 0 seconds.
Unregistering vCenter Server with Inventory Service... Picked up JAVA_TOOL_OPTIONS: -Xmsw-16M -Xnx128M
Registering vCenter Server with Inventory Service... Picked up JAVA_TOOL_OPTIONS: -Xmsw-16M -Xnx128M
failed
Please, restart vmware-vpxd to enable the Inventory Service.
Now going thru to figure out what's wrong with the inventory service.