I mean, it's hard to look at the numbers and make a great case for Royce, the argument for him exists in the context of team dynamics (that which the team lacks, and what he critically provides). So it is simultaneously true that Royce is really important to this team and that Royce is not particularly special.
I don't know how to get my point across without sounding like an *******. Shaq has game-changing skills (all the more if his shot is legit) and Royce keeps the main lineups from falling apart.