Offensive runs/oWAR, the crux of my question stemmed from confusion over 3 separate categories on Fangraphs that assign run values to BrR (base running runs), off (which is offensive runs plus base running runs above average), the part that I missed, and defensive runs.
To sum it up, the better statistical hitter Michael Busch provided less offensive runs than Tucker because of the disparity in BrR. wRC+ isn’t the only component of offensive run value on Fangraphs which I’ve now learned.