Having read the thread being discussed by stalwarts, it finally required someone with less experience like Mark1234 to put thing simply so that there is no more confusing GS Mini with KE, inertia, momentum etc…. Energy level required to see you through a sudden loss of head wind component close to the ground is what the GS Mini provides. In other than the Airbus we come in with an additive factor (as John put it) which is a rough figure mentally calculated by the pilot (or the flt engineer if you have the luxury of having one). The GS Mini removes this mental maths and lets the pilot concentrate on the approach.