Sorry this is a late reply
All I can say re the training is ---Rabelou still has his 'moments' and he still wants to think that HE is the BOSS!!
He's desperate to get into the outside flight of the aviary - but I doubt what he has in mind is a playing session with the birds - more likely to be to strip them of their feathers (lol
Any feathers he finds from the cockatiels in the house he sits and chews the feathers - good job they aren't attached to the bird, but I don't encourage him to do that and try to get the feathers away from him ASAP.
Come to the conclusion -Its easier to raise children!!