If you look at the make-up of the VS LHR routes and LGW routes, something ought to be noticed: LGW = glorified bucket and spade routes, with the 744s being configured differently to those at LHR. I would imagine they are unlikely to start routes which might be more business orientated out of LGW for the time being.

However, don’t be too suprised that some of the American carriers keep some services out of LGW given that (I guess) they would be able to feed those services from their hubs.