USNA just started a waiver today for my concussion. What does being waivered mean? I know I am qualified in the other aspects and have a nomination. At this stage in the game does this mean that they want me?

A waiver indicates that DoDMERB medically DQ’d you for some condition that USNA does not consider a deal-breaker, so they are starting the process to get that removed from your record so you can still be considered for admission. It is a good sign, but not a guarantee of appointment. Good luck!