I see - but there's one problem about Gun CO - without Survivor's Edge, L.Vandal has a low base status chance of 10% compared to Prime's doubled and passable 20%. The 20% range (base Prime, Vandal with SE) is a lot more workable/viable with GCO, but that means you have to pick SE for Vandal which, well, excludes GCO.
So in a way barring any direct stat buffs to LV, it partly feels like GCO is there more for the Prime variant.
Agreed, except for the substantially higher status chance. Like I said previously, that would tip the balance in favour of the Prime.