It's just a saying....but you have to look deeper into it...not sure if it was MAP that said it long ago-- and I may be quoting it wrong "hard work beats talent when talent doesn't work hard" but something like that...
Look at Alabama vs Florida State...Alabama just looked like they REALLY wanted it more, even with the talented FSU roster...I didn's see the Wisconsin vs UVA game, but sounds similar.
So "any given day" isn't as literal as it sounds--
It's can be interpreted as who really wants it, brings it, grinds thru it more, etc, etc...