i have 6 dna matches to my scottish  great grandparents thru 2 of my grandfathers sisters
 so none with paternal surname .
also no matches furthur back with surname . im wondering if there could have been a break in the line non paternal event or adoption of a child as
however my aunt does match 2 people thru one of this great grandfathers brothers .
going up a generation i only get one extra thru line  match  to descendant of a half uncle of my grandfathers mother  KYLE
up to 3 x great grandparents again extra matches only through  the KYLE father in law FLEMMING 
why  are there lots of matches to this line and not the others 
any theories ?