I don't have another grey, but will attest to the fact that Maalik has a few favorite fids from our flock, and a few that he loves to harass mercilessly. It's a crap shoot as to which bird might connect with another. It's great that you can give it a test run, but even then they might start out interacting harmoniously, and then have things evolve into something less desirous over time. Guess you'll have to keep an open mind and see how things go.