gonna have to disagree on this.
as soon as you increase a size in a rink you increase angles that are non existent in smaller rinks, even if youre closer theres still those angles. changing a rink size changes the geometry of the whole zone. All of this doesnt even take into consideration the difference in speed played at the NHL level which is also something to take into account.
My point is, square to the shooter is still square to the shooter. For the goaltender, you're always trying to keep the shooter in front of you unless they're at the near impossible goalline angle or worse, below the goalline, then you're hugging the pipe.
That's an easier transition that doesn't take near the adjustment from large ice to small and vice versa.
A goaltender with good positioning, will have the same good positioning no matter the ice size, because you're trying to square to the shooter.
Backstrom was a positioning master in Europe, came here, zero adjustment needed, stole the job from Fernandez very quickly.