If someone requests permission to a particular point, and then that member is deleted, the approval form will show the pending request as member ID 1. I was making sure everything was working on my system and had 3 different members, all requested permission, I deleted the users from EE and then went to the form: there are three requests for my username there. =)
The deletion process clearly can’t interact with the module, but it should probably have some sort of sanity check to make sure the member is still in existence.
