RPM is blank on ESPN for some reason. Why? I have no idea.
In any sense, I doubt it changes this argument.
Zach does seem ahead in several advanced stats. Does that make him more valuable to the team? Depends how you're measuring.
One could make an argument it's measured in games the other did not play in... DeMar and the Bulls won 2 games without Zach, while Zach and the Bulls got blown out in both games without DeMar.
Extremely small sample size, but, I'm just stating one could make that argument.
Personally, from everything I've put together from myself, I think DeMar is more valuable to the Bulls than Zach. .though its close... I will say, beyond the buzzer beaters though, DeMar's shot has really bad the last three games while Zach has been better in the box scores. DeMar has been clutch, but we also know Zach can be clutch, Zach just hasn't been given the shot at the end of games this year.