I have 11 of these guys and some experience with them. Introductions to new playmates have to be VERY carefully managed. Fights break out in an instant because these birds are highly territorial.
I hand raised a baby because the parents abandoned it. When it was re-introduced I had to intervene to prevent world war 3 with the parents. The neighbours were bouncing off the bars of their cages, hoping to join in.
Separate cages, not far apart. watch how they beheave. Only if there is no threatening gestures can a meet be allowed.
and always, always supervise. ALL the time