I think it's a good idea for him to be out and about with the felines a human family.

I have old Malfi here, he's got a crippled leg, and doesn't use it much. He is only 6 lbs and all the other cats, including fosters, are very mindful of him.

The only one who dares give him a swing is Mr. Jones, my Alpha.
And it only lasts one second. Malfi has a very commanding voice, being a Meezer.

I am happy that Braveheart can do some socializing. It's great, what you are doing for him.