Remedial vs Waiver - how much info and when?

Son has completed DODMERB exam and remedials have been requested. This is not surprising, he has history of a knee injury that is disqualifying.

My question is, should he send all the waiver request info now? or wait till a waiver request is initiated by the SA?

For example, he will send all Dr. records and notes on the injury, recovery etc, as requested. But should he also write a personal letter requesting the waiver, explaining the injury, how it's affected him (I've seen this advice...

Remedial vs Waiver - how much info and when?