I'll leave most of this to Rob to respond to since it is his article that you are asking about.
The last section there though I can make a response to. Different coaches teach different things because different peoples bodies work different ways.
Perfect example pinky finger positions. Spread, tucked, tight against ring finger (there are more variations but that is enough for this example.)
For many people it works tucked pinky for longer skid and sharper movement, tight pinky for a middle reaction, and spread pinky for earlier roll.
BUT for some people they have an opposite reaction from the same physical modification to their hand position. They spread their pinky for longer skid and tuck it to get an earlier roll.
It all comes down to different strokes for different folks(and conditions) and you have to get on the lane and see what works for you.
If it was the same for everyone you wouldn't see different styles in the top 20 bowlers in the world.
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