Reviewing the loan prior to closing allows you time to redisclose when an error is discovered.
What planet is the person from? I agree with jme3's comments.
You can't make any adjustments to the GFE unless there is a qualified changed circumstance and forgetting to disclose the fee is not a qualified changed circumstance.
Also his statement about you not requiring OTI or the seller paying the premium is not accurate. You must disclose the OTI regardless if it's required or who is paying for it and if the disclosed amount on the GFE causes an out of tolerance with the amount disclosed on the HUD then the cure must be given to the borrower, again regardless who paid the fee.