Paul was my summer intern so helping with an update.   Response from HI support:   De-duplication tasks will lead to some update on the CI via user intervention.

1. remove the record.

2. archive the record.

3. No action. Keep the record and know that no updates to the record will be made since the source field value for the duplicate record is set to "Duplicate".

I don't like the functionality of the product.   To your point it should be:

- Mark one of the duplicates (inactive).   Unsure why there is not an "active" field on the CI tables.   It would be so easy to active = false.

- Have the duplication activity of the health dashboard check only "active" CIs for duplications only.