Paternal side DNA mapping progress (lack thereof) snapshot

Decided to stop work on the DNA matches temporarily and produce a snapshot of DNA segments (10cMs and above) identifiable as being Paternal (see embedded WikiTree Widget below for Dad's pedigree) and able to be allocated to a grandparent, or not as the case may be (see the Chromosome Map Key).

Way too many grey spaces as yet!

Update: I forgot to add the "why".
By identifying as finely as possible where each bit of my dna comes from, it gets much easier to slot new matches into place.
Those of them matching at a spot that therefore looks to be a hint to a brickwall ancestor is then a prime target for further investigation as to how our trees may connect, and/or for any commonality between the trees of the matches at that spot for further leads on the connections.

The prime paternal brickwall ancestors:
Archibald HENDERSON blacksmith at the Bridge of Allan married 1804 to Margaret McEWAN from the Drip Moss, Kincardine by Doune
Amelia MILLAR, born Kippen, Stirlingshire about 1815, mother supposedly Miss CHRYSTAL
John DAVIDSON born Chirnside, Berwickshire about 1817 mother Ann COLLINS .

Some day I'd also like to find out more about:
Jane WIGHT's WIGHT side, Jane being the wife of Peter SINTON
Ann ROBINSON, mother of Walter FAIRBAIRN

Click on the image to enlarge, and check below for an interactive pedigree overview linked to WikiTree

 Looks like I need to recruit more cousins back up from my paternal grandmother Agnes Manson DAVIDSON - ie my Caithness BAIN and MANSON etc lines, or more FAIRBAIRN/DAVIDSONs, where the latter are in rather short supply.
Good sale on at FamilyTreeDNA until the end of the month - give yourself, and me, a Christmas present-  FamilyFinder down to $59US - any takers?

Paternal Grandfather Archibald HENDERSON:

embeddable family tree updated live from WikiTree

Paternal Grandmother Agnes Manson DAVIDSON:

embeddable family tree updated live from WikiTree