Welcome Janelle and Flock!
Wow, 28 Years with your Macaw. Congratulations on finally getting a Grey after all this time. Thanks for rescuing him and giving him his permanent landing home. It sounds like you two are already becoming familiar with each other and he is adjusting to his new home very well. It does take a Grey that old a long time to get used to the new surroundings and people. They are one of the most intelligent creatures on the planet earth. The are also so detail oriented that soon he will have every item in the home mentally mapped out down a fraction of an inch placement,, it's color, pattern etc. The best advice I can give is go very slow with him and don't expect him to reveal his true self, likes, dislikes, talking abilities etc. fully for months. When introducing new things like toys, go slow, let him see them from a distance at first slowly over perhaps days move them closer to his cage until finally hanging it on the outside at first for him to look at and perhaps beak, then move it inside once you know he is comfortable with it. Toys or other items he is already used to of course can be placed directly in the cage with no issues. They are very cautious of anything new.
How long have you had him now? I would love to see photos of your flock when you get a chance.