I don't do advanced stats, so it would be purely based on watching every Ducks game year-in and year-out (even this season...) and his general reputation and role (him and Cogs were usually our first PK unit/threat, playing the checking line with Kes/Cogs for years).
Obviously, for any Ducks players, this year is an outlier and we'll see what they do now that RC is gone (which, just my personal opinion/hope, was the team quit on him long ago and all didn't somehow forget how to play hockey). Then again, with BM at the helm, could be nothing changes until next season.