Hunter Lombardo uses a pendulum stroke.....although the shot below is a soft shot, he does this on all shots except maybe a power draw.
http://www.tubechop.com/watch/7222414
Darren Appleton uses a pendulum stroke.
http://www.tubechop.com/watch/7222960
Alex Pagulayan uses a pendulum stroke.
http://www.tubechop.com/watch/7230899
Chris Melling uses a pendulum stroke. He takes some of the arc out of the back swing by pulling the cue more straight back which causes a slight elbow drop at the end of the back swing.
http://www.tubechop.com/watch/7230923
Niels Feijen has a pendulum stroke......no video needed.
The quality of players coming out these days just keep getting better and better. The winning play is trending toward the player with the best fundamentals. Soon, players like Busty/Efren/Frost with their loopy/loosey goosey strokes, will be a thing of the past. In 20 years if you don't have a laser-like straight stroke with rock solid, near text book fundamentals (see snooker players below), you'll have no shot at winning major tournaments.
Snooker players:
http://www.tubechop.com/watch/7223965
http://www.tubechop.com/watch/7224189
http://www.tubechop.com/watch/7224242
Below is S. Frost. Notice on this quick front on shot the up/down motions of his grip hand/elbow..........this is all provided by flexion/extension of a
fixed shoulder (the shoulder and head are stationary, the movement is from rotation of the head of the humerus in the joint space).
http://www.tubechop.com/watch/7232339
Busty is similar but with a lot of added wrist action. Notice the up/down elbow during the stroke.....disappears on the last stroke.
http://www.tubechop.com/watch/7232479