Out of the hundreds if not thousands of videos I own and have seen over the years I have never seen Alison Fischer drop her elbow once... including the link you posted...
what I consider dropping your elbow is when your forearm ends up parallel to the slate...
which is what I see most of the top 10 pros do on shots that have a lot of follow through...
My point is only that out of all the pros I have seen to date; Alison Fischer has the best text book fundamentals of all of them...
I am in agreement with others herein that having a perfect 90 degree pendulum swing is not a prerequisite to playing good pool...
although it is a good thing to start with and strive for most of the time...
I am of the opinion that a perfect pendulum stroke hinders a smooth stroke & follow through because in my opinion you are consciously preventing yourself from following through; thus leading to a poky... Alan Hopkins kind of stroke... works for him, but IMHO he is the exception to the norm...
take a look at hall of famers Steve Mizerak, Willie Mosconi, Irving Crane, Luther Lassiter or Mike Sigel these guys had some of the most beautiful strokes I have ever seen and all of them dropped their elbows frequently...
Absorb what is useful (to you as an individual) ... Bruce Lee
