Improved is a whole lot more than that
At minimum:
Walsh
Arthars
Cobbo
Jensen
Riki
Patty
Haas (added ballplaying and offloads)
Kobe (was a reserve grader)
Smoothy
Billy
Herbie, Flegler and Palasia all improved before moving on as well
I've excluded Mariner and Ezra, because there's no baseline, but they have improved since starting. Mariner being top try scorer and adding wing play.
Willison similar, but he's looking elite.
Piakura is a regular first grader... probably starter a year too early though
Staggs was elite in about 2020 (I think??), but he has also improved to become an origin player and has upped his workrate