It'd be a huge call to move Teddy on next season, more likely, the Roosters being a bit smarter and more ruthless management wise they'd be telling Sualii the spot is his in another year or two. In the meantime he's there to learn from Teddy, and of course arrange a deal that's attractive enough to keep him well happy.
If it's true that RU are offering the kind of coin being reported, there's just no way to match it and keep a competitive roster, so all they have to sell is being at the Roosters, and whatever that brings.