The VP nom is there really for the AFA to get that one candidate in where no other nom works to get them in. Remember, it is a giant jig saw puzzle, just because you get a nom from your MOC, it is not necessarily true that they will charge you to that source. The nom gets you in for an apptmt, from there they also can use other sources at their discretion i.e. Supe.
By not applying for the VP it ties their hands if that is the only one left.
I have been here for several yrs., and I know of 2 posters that were awarded the VP. Both were alerted of being charged to the VP in the May/June time frame after the March Mass Mailing. So, to me that says they wait on it to let the dust settle and then charge the VP spot.
If I recall correctly, also both came off the NWL. Won't swear by it, but that is how my pea sized brain recalls it.