Jack O'Brien vs. Unknown Sullivan — Career Comparison

On the career numbers, Unknown Sullivan posted the stronger offensive profile against Jack O'Brien. Unknown Sullivan posted stronger numbers in OPS (.750 vs .700) and on-base percentage (.375 vs .331). Jack O'Brien had the advantage in home run production (11 career HR at a higher rate). By the career numbers, Unknown Sullivan had the stronger overall case — though those totals don't account for the eras and run environments each player worked in.