The real issue though is how other GMs will treat this. It makes less difference if it's good or bad, what matters is how much faith will GMs put on it. Because you can use it to your advantage in trades. If it more or less matches the other advanced stats DanH mentioned, it will make no difference.
Still, we can assume that teams like Dallas, Houston, Philly or Boston etc will value Amir and lowry a lot more than they will demar or vasquez. So trade discussions with those teams should be structured accordingly. We may be able to oversell Amir to one of these teams, while we'll have to beg them to accept derozan in a trade etc.