Those preening pictures are the cutest!
I've been thinking about this a lot lately. We have a bonded pair of budgies, but just the sole GCC, so while Argo has a birdie flock, I'm not sure it's the same?? It seems like even numbers of birds work better, which would be another reason to get a 4th. However, he is still wee and definitely bonded to the human flock members, so we aren't having any issues right now. Pretty sure my hubby would lose his mind if I suggested any more birds at the moment, lol.
Please keep the stories of "sibling" GCCs coming though, they will be great to reference when we are ready to make that decision!