Nope, that's my point. Only if velocities are the same does the High BC win out. In many cases, the lighter bullet with lower BC will have less windage drift as it has less time in flight vs the slower, heavier, but better BC bullet. There's a trade off point.
Wind drift does not depend on the time in flight, it is proportional to "lag time", so heavily in favor of BC.
Berger 215 (.354 BC) at 2800 fps = 18.8" drift at 600 yards
Berger 168 (.251 BC) at 3150 fps = 23.7" drift at 600 yards
You would have to slow the 215 down to about 2400 fps to make it have as much drift at 600 yds as the 168 at 3150 fps.
And you would have to speed the 168 up to about 3600 fps to equal the drift of the 215 at 2800 fps.
