They are both young males, and intact. It sounds like "tussling" is more like semi-serious sparring, both trying to establish themselves as leader. Especially Riley, now a mature teenager, is challenging Booger's seniority. You guys are lucky they get along at all, what with female hormones all in the air!
All the basenjis in our dog park gang are neutered and that accounts for a lot of their ability to be an extended family, taking in youngsters and new dogs pretty easily. They all seem to get annoyed with "teenagers" between about 7 months and a year, that seems to be when they need to be taught their manners. My Topper is the Alpha male and all defer to him, so the young males have nothing to prove, and they are happy to just play and chase each other. Thank Goodness!
Anne in Tampa