Recently, the idea of swinging "Over The Top" is being advanced as a principle to help develop a solid repeating golf swing. Although not suggested in either of Ben Hogan's Books, there should be no objection to anything that seeks to advance learning golf.
Nevertheless, at the end of day achieving "Parallel Thru Impact" remains the Cardinal Principle to bear in mind. In fact, the discovery of Mr. Hogan's "Double Parallel" @ Swing Address makes the principle of OTT somewhat moot.
Discussion: Players who "Do Not" establish the Double @ Address would have to "Adjust" in Transition so that Parallel Flow ensues before impact. ...Hence, the reason Over The Top can prove useful.
As it turns out, Mr. Hogan's "Peek-A-Boo" Parallel Back Shoulder is found in all Major Champions dating back to Francis Ouimet and, here too, no "Over The Top" Move proves necessary, particularly with Hogan's Secret "O-Move" now offered for serious consideration .
Again, given the info Mr. Hogan provides on Page 50, there is no reason to introduce an extraneous move which can easily miss the Parallel required to achieve Consistent Square Impact Down The Line.
Apostles of OTT would do well to study Page 50 of the Five Lessons as well as "O-Move" benefits, neither of which makes OTT necessary. In fact, Opening the Back Shoulder Joint in the Backswing runs counter to what OTT would recommend and defeats the Inside Parallel Track responsible for so many Major Wins.
As it appears in Golf Research, the swing always performs as it should when the Hogan Power Deuce is put in play; giving alert players no reason to look further for a swing that eliminates tendencies to Push, Pull, Hook or Slice. Given this, it's best to have a Parallel "Peek-Boo" Back Shoulder before the swing starts instead of having to search for an Over The Top "Adjustment" while the swing is in motion.
(Kindly See "GOLF WINDOW" immediately below to fully appreciate the Parallel & "Cubic" reality that is the Golf Governing Law.)