Len aka Redial
I have had Basenjis since 1973, and done the apprenticeships of handling, showing, stewarding, and since 1990 judging hounds. I have four at home, one of each colour, and two boys and two girls. I am no longer breeding, but I have learnt a lot from my Bs.
I would pick him as having some B in him, but not all of him. Please learn to Dremel his nails, as they can cause his feet to splay. If you can hear clicking when he walks on a hard floor, that is time to get the Dremel to work. he looks a grand dog, and seeing that he is likely to be half labrador, then get him into obedience. He should be great at being an interesting dog.
get into the habit of knowing the signs, and get into a routine. When they first wake up, boot (not literally) them outside, and praise them when they go. Take them for regular walks, it is for their enjoyment, not yours. They will get into the routine of pooping and piddling outside on their walks (make sure you pick up the dogs logs). Dogs love routine! Make sure they go outside after a meal, and watch them.
I have to find a spot where there are no sheep around, as farmers are able to shoot (wild) dogs running with intentions on the sheep. Anything that runs is fair game. Mine love the free running. Find a football/cricket ground, or even tennis courts, to let them have a free run. As Sally Zande says, let em run. If there are two of you, drop one person off, and drive further into the woods or whatever, then let them out. It is fascinating to see where they go. And see who is the first to come back or to the other person.
They will come back...you just have to wait.