U6: A standalone clade?

It is a lineage that spans west and east Africa, and spilling over to portions of southern Europe and "southwest Asia".

In looking at the following diagram...


For those with inadequate screen size, view the above image in full with: here

...it is apparent that at the least, U5 and U6 diverge into respective branches independent from that of the rest of U macro-haplogroup. Similar observation