If an Admin needs another Admin to review an Approval there should be a drop down to pick the Admin that needs to approve/review it.
Ex: 2 Admins; #1 was on the Sales Call and knows the details. #2 Admin creates the Invoice but needs the #1Admin to check it before it's sent. Just pick from dropdown Submit To: Admin1
If not there is a list of approvals #1Admin does NOT need to approve.
also; If approvals is enabled; being an Admin you shouldn't have to go to a separate page to approve and send; it should be exactly as it is without approval enabled for all Admins.