First, an explanation of the overall context is needed: A CIP has been filed by a sole inventor (me). After filing, it was decided that another individual probably should have been credited as a co-inventor, due to contribution of an idea that later was incorporated into specs and claims. The inclusion of that co-inventorship has not yet been done, but the 1st OA has been received.
The claims based on the other person's contributed idea have been challenged as reading on prior art. It is not yet clear if that can be overcome.
If those claims are ultimately dropped, there will still be references to that concept in the CIP's specs – it just won't be part of any claim. In this scenario, is the question of post-application inclusion of the other person as an inventor now moot?