First, let me say 'welcome' to you Pedro. Then I have to tell you that not all pure blood B's have black noses, our little gitl, Bitty, has a dudley nose, dark brown and pink. Our second dog, an adoptee from BRAT (Basenji Rescue And Transportstion) was listed as a Basenji mix but I was totally convinced that he was all B, he had all the physical traits, tight curled tail, pointed nose and stand up ears. His chest is white as is your Neymar's with the white collar. All B's have 4 white feet and the tip of their tails are normally white. As you mentioned he has the normal wrinkles. Taking all of these points as a group your Neymar has all except fro the tail, which in my estimation would make Neymar at about 90% B. So, again, let me say welcome to another new Basenji lover.
Thanks, I'm glad that you agree ! I'm getting a pure B now to be Neymar's companion, a black and white female ! I made a thread about her on "Show of your dog" section ! As she grows up i'll manage to even more tell the differences or similarities 🙂