My quick observation is that although their pedigrees do not show it there is a good chance of a genealogical connection between B6 & B7 although I think their haplotype is very common. Not much connection between the other R1b1b2's.
I have encouraged the Bull website to post a link to the Bull/Buell DNA project. http://bullstonehouse.org/
This is the NY line of Bulls.
I understand the idea of including Turnbull with Bull. But from the
standpoint of origins there appears to be no British connection. Turnbull
is Celtic and is found exclusively in Northern England and Southern Scotland
in the 1881 British census. Bull on the other hand is English and is found
exclusively in the midlands and south of England in the 1881 British census.
Of course there may have been some crossover but given these facts and the
rareness of the names I would guess any Bull/Turnbull connection is
genealogically insignificant i.e. irrelevant except in very rare cases.
A 4g gm was Eleanor Turnbull b 1794 in Northumberland, Eng. hence my
interest in Turnbull. Another 4G gm was Elizabeth Bull of Orange Co, NY going back to William Bull of Staffordshire, Eng.LRAYVICK@cox.net