Now will you answer the question as to how you determined that Nicklaus was a wrist putter
Sure. I would be happy to.
Look at this shot from Jack's early days.
Compare that to Tiger's perfect big muscle pendulum.
You can clearly see from the first image that even though the putter head is about half a foot off the ground and at the end of the stroke, his hands and wrists are in between his thighs. His hands have not moved much at all. Most of his stroke is coming from the wrist.
Compare that to Tiger where at the end of the sequence his putter head is just as much off the ground, but his hands are well outside his left thigh. He is clearly relying on his shoulder motion for his pendulum action.
I think these pictures pretty clearly show the difference between the "classic" wristy putting stroke to the "modern" pendulum stroke using the big muscles.