I have been to all if not most of Lorens lectures here in the uk over the past few years now.
I think there may be confusion as to what Loren was saying and or how this has been transfered.
The aim is to reduce GCT!! without a doubt that is true! and this is the aim of every athlete and coach.
However, as Star has correctly pointed out this reduced GCT is a result of other factors such as strength, power, RFD, stiffness, form etc etc etc it is these variable you work on in order to reduce GCT, GCT is merely a measure (along with your PB) to the effectivness of your training
RFD is vital through the correct running form.