There is a world somewhere between reality and fiction. Although ignored by many, it is very real and so are those living in it. This forum is about the natural world. Here, wild animals will be heard and respected. The forum offers a glimpse into an unknown world as well as a room with a view on the present and the future. Anyone able to speak on behalf of those living in the emerald forest and the deep blue sea is invited to join.
Roaring is hardly an accurate way to map the position of lions. If Ubuso hasn't roared for a while, but his brothers did from the east. It would be very easy to assume he would be there with them.
And while they have lionesses that would like to mate, they have plenty of opportunities for that in Singita as well. So that probably didn't drive their expedition south.
So beyond an error, I don't really see any reason for the Mhangeni to come in contact with the N'was.