It's wise to Check the span/grip every 2 to 3 years, or any changes to the persons physical body. Weight gain, arthritis, wearing a brace, physical game change, etc....
Like these people that wear those adjustable wrist brace. Majority of the people that use them don't know how to use them properly. Or, get fitted for a ball without having the brace on.
Having different pitches will just create more issues. Keeping it the same will help build consistency.
I went through several changes in my grip through the years in my return. I'm a bit older now and my body isn't as "trim" as it was 15 years ago.. but with proper fit by the pros and coaching.... I have more revs now then when I was 30. I bowl more now then when I was 30. I have no pain whatsoever in my right hand from bowling, compared to when I had typical 1/4 reverse thumb 3/8 lateral fingers blah blah...
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