First of all He does use Switch grip interchangable thumbs and they are made by Turbo Grips not Vise.  I know he does put thumb in first and rotates his hand afterwards and this has nothing to do with the switch gip its just to get his feel right. I however do not know if he also turns his thumb each time to make sure its locked into place or not.  I don't know what his pitches are but can probably find out.  I use switch grips and they stay locked unless you move them yourself I guess he could do it to assure himself but like I said he moves his hand I know for sure and has nothing to do with the switchgrip.  He likes thumb in first then fingers so he won't be inclined to grab as much.
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Edited on 10/20/2005 10:24 AM

usually when you put in your tumb first, you dont want to get so much fingers when you release.