runway08
They already bus passengers when late night arrivals use stands 10-15, same as Gatwick and other major airports. Use of the Pond extends this for the overnighters.
Signatures VVIP entry/exit point will be at the same place, it is only the based (hangared) aircraft which will move (as far as I can see). There is already lots of shuffling around overnight for the next days departures.
As for the layout, historical mis-managment from LBC.
A Multi-storey carpark is already in the latest masterplan.