There is CLUBHEAD LAG, ACCUMULATOR LAG, and PIVOT LAG. ACCUMULATOR LAG and PIVOT LAG are big deals, but I believe CLUBHEAD LAG is the main "secret of golf". Tom Weiskopf and Greg Norman, for examples, do not have much of a LATE HIT(#2 ACCUMULATOR LAG), but do have Clubhead Lag, or we would never have heard of them.
All tour players have CLUBHEAD LAG. They may not be able to describe Clubhead Lag, and may not even be very aware of it, but they have IT, whether they know it or not. They load the shaft and clubhead(stressed shaft), and sustain the lag at least until impact. They just have IT, most of them probably inately.
The TGM, and MORAD trained teachers seem to be among the best in the world at teaching golfers to acquire CLUBHEAD LAG.