Introducing Kitten to Resident Cat?

So we raised two cats from three weeks old, Ace and Bandit. We took our two older cats outside to finally give in to showing them the way of the cat. Lol Seven months later they were playing out front with the kids. Bandit was running with Ace following him. They ran from across the street towards our house and Bandit was struck by a car while Ace stopped in time. This happened five days ago. Ace isn't himself lately and today my girl and the kids brought a kitten, about 9-10 weeks old, home.

Ace does not like the kitten at all, he just hisses at him and won't be in the same room. He hisses and looks behind him even when the kitten isn't there. I'm afraid that he'll decide to not come home one night. I don't want to lose Ace also. The bond is really close with him and I don't want that to happen. My girl said give it a couple weeks. My question is, can bringing this new kitten, Cruz, into our home make Ace not want to live here anymore or even worse decide not to come back one night?