Do we still have so called dedicated strike corps or part of them merged with some other formations? Part of them are forward deployed.
Sir eg XII Corps is pivot Corps. It will already be inside by the time XXI comes into play .. leapfrogging to undertake depth ops into Baluchistan and seaside Sindh.
Enough assets with XII corps to take on ...XXI will simply reduce time to go deep.
And logistically, yes ... strike corps had stuff forward staged always ... not fully, but couple of hours from the staging areas.
That is why, the moment M comes, within 6 hours first echelon will be in forward location from depth and within 96 hours offensive ops by deepest corps (in terms of troops location) ie XXI . For I and II expect 24 to 48 hours max. But that is a different ballgame