OH MY GOSH, adopt them both. That way if the Mishka doesn't want to be bothered by a kitten they can keep each other company!!!!! If I'd had the sense to do that when we adopted Jazz I think things would have been better.

Just to give you my experience, I had Ripley as an only cat for 10 years before we adopted Jazz at 14 weeks old. He took it very hard and was miserable (and deathly sick because he caught her URI) for months. Once he healthy again he began to tolerate her and then I brought Scout home. That made Ripley and Jazz kind of bond in the sense that they were both ticked at me.

Anyway, none of my three are buddies. They don't cuddle, groom each other or sleep together and sometimes we have some harsh spats but some how it seems to work well enough that they seem happy most the time and I've got my wonderful babies (and sometimes brats).