Contact (most whippy pros) is made with an almost totally neutral wrist.
Look at the Fed vid and freeze on the contact. The wrist is very close to neutral, not laid back. That's neutral. You can see the same on almost every nadal and djokovic fh too.
The wrist moves during the stroke and before contact (atp ssc type strokes) and is not a by product of the follow through.
You'd probably be better off with a more stable wrist type of stroke. Incorporating the movements you see in fed et al vids is very difficult and requires a lot of work and maintenance. a lot. (if you want to do it correctly w/o arming the ball, proper follow through, weight transfer, hitting structure etc etc)
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