While this could be Step 4a. There is actually more than meets the eye with proofs and the approval process. By this point, all that should stand in your way to giving this project your “blessing” is to approve the proof.
The reality of the situation however is that in looking at the technical and logistical side of the proofs, the eye can catch things that you have seen before – in a whole new way. Things don’t read right, there is information that has sense been proven/provided otherwise.
This isn’t because of a lapse at any point in the process – this is just a reality of putting together projects. Remember the line about being a constant evolution? Your materials will evolve along with you.