With respect to 1) this is not for the ELM to consume events but for the ELM to publish internal ELM log events onto the bus (for the System Log feature you see in the UI).
ELMs do not run a databus internally, only receivers, ACEs, ELSes and DSBs do. So when the ELM records internal log events they need to be published to a databus on a different appliance. The upgrade advisor is relatively new and it is difficult to express nuance through it - the ELM doesn't need access to the databus port on all appliances, just on at least one (e.g. in my environment with a databus, the ELM is recording its logs to one of my receivers instead of the DSB).
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