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Springer = minor career 955 OPS, 26.4 K%, 12.5 BB%, .257 Iso, .379 BABIP
O'Neill = minor career 867 OPS, 28.7 K%, 8.7 BB%, .240 Iso, .348 BABIP
O'Neill has been significantly less productive, K'ed more, walked less, hit for less power, and for a worse BABIP than Springer in his minor league career (not just AA).
To be a pitch stalker with high Ks in the majors, you need to DESTROY the ball when you get your pitch and you need to be able to let some borderline pitches go.
I honestly haven't scouted O'Neill much either than a brief look at his swing. I don't feel that I need to, because his statline tells me the whole story in this case.