Where Lydia Ko went wrong is when she allowed David Leadbetter to change her swing. Ko was doing great until Leadbetter changed her swing. IMO Leadbetter changed her swing in order to sell his new swing he was promoting called the A Swing.
It was basically an exaggerated Jim Furyk swing. He was hoping to use her as a model to sell books and screwed her up in the process. It's a shame, but Leadbetter committed malfeasance in what he did to Ko IMO.
It's a reminder that the old adage of 'if it ain't broken, don't fix it' is true. In the Tampa Bay area we remember Beth Bauer who was an LPGA rookie of the year back in the early 2000's only to end up a cart girl at a local Tampa Bay area (Heritage Harbor) course.
Bauer's mistake was chasing distance and it led her to selling beverages as a cart girl instead of picking up trophies on the LPGA. I think Ko can make it back, maybe not to the extent she once was, but can win again on Tour.
Ko reminds me of Brooke Henderson. Extremely talented at a very young age with her own natural swing. Henderson is naturally longer than Ko, but she has her own swing that works. It would be a travesty if anyone changed Henderson's swing. Just like it was a travesty to change Ko's swing.