Well, typically when I think cat to kitten intro, it very young kittens...12 weeks old or so, that's the easiest. The main reason is that the kitten has no fear of the older cat...it hasn't developed any territorial instincts. It's totally oblivious to anything but playing and where the next meal is coming from.
By 7 months, a cat knows what territory is about and is very aware of surroundings, and has had time to develop fears. And will likely display some aggression to the adult. So an introduction with a 7 month old is not as easy as a 3 month old. Although, it's still easier than a full adult.
And of course it depends on the personalities of the cats involved. Even with Holly only being 11.5 weeks old, Maggie pretty much hated her for months. Can you imagine what it would be like if I brought in an adult (which I never would...because I know how Maggie is). On the other hand, Kobi was snuggling and bathing Holly by the next day.
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Holly, Misty & their friend, Jake, the dog.
Onyx, Callie May, Maggie & Kobi forever in my heart.
Yes, I know I need a new signature pic...someday...