Not necessarily. I don't particularly care for the dominant and non-dominant labels because I think the leave a lot out about the dog. My mom has a male that would be described as "non-dominant" but he is a resource gaurder and that can cause problems in the house. The only reason it works is because her other male doesn't fight with him over stuff and when the other one has what is best described as a tantrum he literally sits on him until he calms down. Most would describe my mom's other male as "dominant" or "alpha" but he is also mellow and does not start fights.
Fair enough. I know Kananga is non-dominate for the most part. Although I do see what you're saying about it being too vague. I have observed him "stand his ground" on a few occasions. He's very submissive with me. I can wake him, pick him up, take his food away, etc. He will never growl or struggle. But around other dogs, if a dog tries to provoke a fight, he will defend himself 100%. Although he has never provoked a fight. Kind of strange really. First i've seen of this personality type. He can be spooked easily but he still remains confident. So I wonder how he'd do with another male basenji. He's always gotten along with other dogs (unless the other dog tries to attack him).
Have you talked with Kananga's breeder - does she think that he could be paired with another male? In your case where he came from a responsible breeder and you haven't had him a year yet, she would know him best and would maybe be able to give you the best advice, I would think. Maybe she has another b that would be a good match for him.
I'm not serious about getting another basenji quite yet, but I'd perhaps consider talking with his breeder when the time comes. His breeder is not 100% reputable, at least not on here (some might already know who I'm discussing), but the business practices I've encountered have been sufficiently ethical IMO. Although there is a slight concern (my only one) over health testing, they have made improvements in recent months to put more emphasis on testing (specifically Fanconi).
Regardless, I personally would rather get a rescue if I got another Basenji. I originally wanted to do that for my first one, but unfortunately most shelters (including BRAT) were a tad discriminative of condo owners. I think for a 2nd Basenji it won't be so much of an issue considering I'll fully understand the breed at that point (having one for a period of time). Again, something I've considered but I'd rather wait a bit longer to allow Kananga to feel comfortable in his home.