I bet he is very entertaining. I have a parrotlet & lovebird myself and I my parrotlet thinks he would be bigger than your grey, he has little man syndrome. That's great you rescued him and gave him a good home! I also adopted mine. But they were well cared for by an elderly lady who couldn't care for them anymore. I would love an african grey one day. It is funny how much of a pig they can be though!
African Grey's are amazing birds! My neighbor has one that learned how to bark, and it barks at my dogs when I walk 'em. It's the funniest thing. The dogs have no idea what's going on.......the bird does it just to get a rise out of 'em.