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Sell high. We're overselling how much he hit in AA. The high K's were still present (26.1%). Still not walking enough to be TTO hitter. And still not enough power (.215 Iso).
If players like O'Neill went on to successful careers we'd see more player types like this in the majors with similar minor league progressions. But we don't.
I can't think of a single above-average hitter in the bigs that had a K rate above 27% and an OPS under 880 in the minors.