I don't see why being on a rookie contract impacts how good someone is. That's a very confusing angle.
Keep in mind he is not a free agent. He is on a freshly inked mega-deal. Could he try to leverage a change that converts base salary to a guarenteed bonus? Yes but that typically happens during a period where the team is trying to create cap space. So, that might only happen in that case and I would assume would be piggy backed on an extension of some sort(even if only void years).
I am just saying he isn't going to show up having much in the way of leverage unless he is being utilized to clear cap room.