We've discussed this as part of another tracker item.  We definitely don't need to echo back the new coverage because linking of request and response should always be done using the technical mechanisms FHIR provides, not the data shared.  However, because the requirement was set in the version of the IG that went to regulation, we can't remove it.  In the prior disposition we agreed to add guidance that the requesting system should ignore the echoed-back coverage and NOT use it to match request and response.