This will probably happen before their U13 season. Going into the fall they're not going to have kids rotating in goal on the full size goal, trust me on that
it's the third team. At U13, they may not carry 3 teams anymore
They carry multiple teams per year up to U17, when they drop to 2 teams only. I would guess they would have less than that beforehand if not enough kids were interested.
if the club is that large, they should have gosling training. I'm surprised no one on your team wants to attend
I am not sure if they do yet - my son would not be interested, as he is neither especially inclined to play goalkeeper, nor does he have the right stature or skill set for it. He does ok as a goalkeeper in futsal (smaller goal, slightly different requirements), but every time he has done it in soccer, it has been pretty bad.