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I would be surprised if weight loss was directly (and exclusively) responsible for the velocity drop.
It looks like there has been a declining velo trend for a while and this may just be the next step in that trend.
The 22 year old Tiger Woods attacked every golf course by trying to overpower it.
Tiger at his peak however, used that power judiciously and relied on his vaunted 3-wood stinger and unbelievable imagination.
There is always a transitional aspect to the games of the best. One of the things they almost always learn is conservation of energy, as well.
He'll throw 91-92mph this year. Coupled with the other stuff that bamboozles guys, it will be more than enough.
moe