From VA "Lender Reconsideration of Value Request SOP... Any party of interest may request a change to a NOV. For documentation purposes, every such request must be in writing. Only one request will be completed. The change request must be submitted to the lender."
The seller absolutely has the right to request a reconsideration of value according to the VA itself, but the Veteran must approve the ROV request. If the seller sent it in directly instead of sending it to the lender to have the lender confirm with the veteran and send it in then they did not follow SOP correctly.
I appreciate your advice regarding not being an advocate. I would not be doing this service to advocate for them, there could be plenty of times that I review the appraisal in question and inform my client that it is a solid appraisal and there are no grounds that I could find to craft a reconsideration of value.
Let me ask you this if you were a layperson and selling your home and were in contract for $840,000 and the appraisal came in at $820,000 and you had to bring the sale price down or cancel the contract, would you pay to have the appraisal reviewed and be assured that the value at $820,000 is solid and you aren't bringing down the value on a faulty appraisal?
Have you ever done appraisal reviews? Have you ever seen an appraiser make a mistake that affects the value or overlook a sale that is much more comparable than what was used? These things happen, would you not want to make sure that this did not happen to you and that you are not giving away $20,000 that a simple reconsideration of value could avoid?