In what sort of environment do you think he would thrive?
Either in one where he is the main pet/bird, or in a setting with another macaw.
Chaos has lived in my living room for 20+ years, so he's never been alone, always just a few feet from me.
Isolation (or a room of his own) I believe would devastate him as he's never felt it.
He has never been around other birds his size, but I think would enjoy it and even bond with one.
Chaos has never developed a mate bond with me, so he's ripe for falling head over heels.
He likes my smaller birds, the dangers in size differences though have always convinced me to not allow them to mingle.
A family/person that allows him his space is what I think would work best, he is not a cuddly bird, but is one that loves company.
Who knows though, in a new home, new people, new place, he could fall madly in love with his next owner and turn into a totally different bird.
I think it all depends on the new owner's patience and personality.