Brenden, I don't see anything in the workflow stating who it affects. The workflow is a basic publishing workflow and the Scope is set to the root of the site. I do have a role set for the approvers but nothing else in the workflow seems to let me define roles/users.
Ilesh, The difference between the users that I know of is that the user with access to the comments is also in the Role that is the approver of the workflow. It seems odd that the approver would add comments and not the submitter though so I ignored this. I can look through the UI personalization again to see if something is setup different but if you know where this feature is in the settings that would be helpful.