Because I honestly think that for the type of trail riding he does he would find it much more enjoyable on a 4t that already has that lowend grunt out of the box.
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This was my advice to him before he bought that bike so I agree. I also agree with everything else you said. In Trevor's case, he's trying to make a YZ be a trail bike and while I know it can be done, it's not the best platform to start with for that purpose. So I can see why he's trying (or looking to try) lot of different things.