From again, I find that disposition of the Lannisters forces to be conflicting with Kevan’ s statement to Cersei in Danxce here he states that the best part of the Westerland forces were at Riverrun with Jamie, which doesn’t make sense in your breakdown of where there remaining forces are. Give Daven Lannisters presence as Warden of the West and commander of the siege before Jamie arrived is it not probable Westmoreland forces either rerouted to deal with Riverrun or remobilized?