Well, it is hard to tell without seeing the situation. Young basenjis play pretty roughly, and sometimes with loud vocalizations…but it doesn't mean that it is necessarily going to escalate to a fight. Usually in a girl/boy combo, the girl looks like she is charge most of the time...the bitches are usually more demonstrative with their "knock it off" displays. That doesn't mean that she truly is dominant...but just looks it.
Anyhow, I would let them sort out their issues between themselves, but keep a level of control where you can say 'knock it off' and they do. It helps to place yourself in between them when things get heated, rather than yelling from across the room. BUT, if they are just playing I would let them sort it out...play is how dogs determine status without having to resort to fighting.
It is also hard to say when you have to start worrying. USUALLY (not always) a pairing of male/female is pretty good, often some snarking and bitching but no real damage....but then as a lot of folks say, everything was fine, until one day, it wasn't.
My guess, just from your description, is that they are just settling out the details; and Tayda is trying to get the message across to Lenny when enough is enough....he will learn, EVENTUALLY