Dubinsky:
First-line level performance with second-line level minutes.
RoR:
Second-line level performance with first-line level minutes.
And these represent the last few years, so none of your "he's having a down year" silliness applies.
Dubi is unquestionably a better player. There is no debate to be had. It is a matter of concrete, demonstrable fact. Yet there was lots of criticism directed towards JK for extending him to a $5.85m/year extension.
Given that, O'Reilly's arguably not worth the $6m/year he's paid right now. And he wants more. And he's already demonstrated a willingness to hold out for more.