I have this tendency to get along with every domesticated feline while sometimes finding it hard to tolerate members of my own species.
My sister and BIL were found by a young stray tomcat who went on to share their home with them for sixteen years. Mat, like Orion, was unflappable. No canine ever lived under the same roof with him. But I'll always remember how calm and cool he was when a new kitten joined his household after he'd been there some three years. They kept me laughing one night while I was in town for a visit. First Mat would lie down on a window sill, deliberately letting his tail extend toward the floor. Then the kitten would take a running leap, grab onto his housemate's tail, and gleefully swing back and forth like Tarzan. You could see the pure delight on the little guy's face and the measured tolerance on that of his senior. Talk about priceless.
Mat had one "T" in his name because, in the beginning, he always greeted his chosen humans from the welcome mat at their door when they arrived home from work. He first showed up with no ID - on the outside (tags) or the inside (microchip) - and was never claimed. However his first year or two of life had gone, there were no signs of abuse but obviously he'd picked up some survival skills. Probably his roll-with-the-punches nature had always been present. It stood him in good stead not only with his hyper kitten friend, who he eventually survived in the literal sense, but also with the four children his human stepparents went on to have. He and my much-posted-about Weasie were on to something. Both of them were gregarious, right down to having "auto-purr," and were adaptable to new persons and situations. And they each lived into their very late teens. Hmmmm...
P.S. It's fantastic to hear about how well this tough transition is going. Bruno is looking on with approval in his new form. A pup has found a home and is settling in happily. The "new normal" is looking good!