The "Clubhead Lag" that you refer to with Hogan and Garcia is Accumulator Lag. Both men have Clubhead Lag. And Pivot Lag, too. But the trailing of the Club behind the Hands is not Clubhead Lag. This is a widely held misconception, even among long-time students of The Golfing Machine.
Nothing in The Star System of G.O.L.F. is more important than Lag. And yet the separate identities of the three types are not generally known, much less differentiated. Time permitting, I hope to post on this very important topic in the reasonably near future.