Pet, I used to have a Lory and his vocabulary skills were incredible. If they are the 2nd best, I am imagining the Grey's are doubly incredible. It used to take my Lory about a week to learn something new and spending 3 spans of just minutes during each day. Man I miss that bird!
Funny story about how I came to know all of this as far as the capabilities is when I first got the Lory, I didn't even know he would be a talker until my sister visited one day. She walked up to his cage and said hello, and he said it back... I nearly fell off my seat
Again Pet... my best of luck to you. I am sure you will both appreciate each other
(you better post pictures!!)