Admin edit of older order forces to add values to newly added required fields
How you resolve this depends on your Drupal version, so please be sure to specify Drupal 7 vs. Drupal 8 in future questions. On Drupal 8, you can likely resolve this by editing the form display mode and not including those fields on the normal admin form. However, in Drupal 7 you'll have no such option. You'll need to use hook_form_alter() to prevent those fields from showing up on the order edit form instead.

Re: the administrator name, there's no way for us to help you without knowing how you've constructed that View. If it's just showing the name of the last person to edit the order (i.e. create a revision of it), it makes sense that it'd be the administrator. It should normally be pulling the name from the order's billing information profile.