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I have an older cat, and he’s always lived alone. My roommate recently picked up a kitten, and it took months for my cat to get used to him. Even still, he’s rather annoyed by him often because of his incessant playfulness, but he’s not growling and hissing at him constantly anymore.
I’m sure your cats will learn to get along, hopefully soon sooner than mine did!
Keep in mind that cosmic is still in an alpha build. It’s missing a lot of features and his buggy here are there. I’m sure it will be pretty awesome and once it releases it 1.0 version.