Say the first person in a signing order did not attach a necessary document. I can markup or change a field to trigger a revision which will return the document to them to initial and hopefully read and attach the missing document.
The problem is that they could just initial my markup/revision without taking the action I requested, thus completing the envelope.
What I want is to be able to kick an envelope back to previous signers without first signing it. In other words, I want to always have final approval.