The difference is all fielding. DeJong is a shortstop (and a good one). Yelich is a little bit above average in RF. (Also DeJong's batting is a little better than you made it seem, as he's leading the league in doubles.)
But perhaps more to the point: the difference is 0.1 WAR, which really doesn't signal anything. Heck, it could be a result of rounding. A (so far) great hitting shortstop is as valuable as a really great hitting outfielder. That's totally believable.
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