It could simply be a preference for making the putouts himself, and not making unnecessary throws. Taken in isolation, assists don't mean too much for a firsbaseman, as it many fielding chances are discretionary as to whether to take the putout or flip to the pitcher - something more representative of style than skill. The difference can show up in putouts, but it's a little tricky to detect that, as so many putouts are simply catching a thrown ball.
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