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Clearly a little too far from the plate and is reaching at outside pitches. And still managed to slug .670 in AAA.
With Edgar as coach just recently fixing the same flaw with Trumbo.. bet BIG on the upside.
I wouldn't worry too much about the age Doc. Donaldson was another player type who changed his swing mechanics late in his career. When guys change who they are, you re-assess. Although I get your point, easier to say with pitchers, more rare with hitters.