Is he worth 4.5M at this point? 19 points in 40 games is a 39 point pace. Even if you give him the benefit of the doubt and say he's been unlucky this year, he's clearly on the decline, and once that starts, it tends to continue.
ROR has played a physical style game. Those types of players usually see a massive drop around age ~30-32 (Simmonds for example is only 34, and has been a 4th liner/AHL calibre player for years now).
I'd love to re-sign him, but I think the caphit should start with a 3, unless he really takes off down the stretch.