Board Thread:Warhammer 40k General Discussion/@comment-91.224.27.226-20131031140001/@comment-8881468-20140102143625

vulcan f.e. did not know  all the missing primarchs as has been mentioned in, if i remember correctly, the "the primarchs" anthology.

if we look at f.e. the space wolves or raven guard, then over time, the gene seed changed the astartes.. raven guard  becoming paler getting dark haired and f.e. the canines of the wolves growing and becoming more pronounced. or we could take the lunar wovles and the "sons of horus" mutation, where many marines look like their primarch.

so basiccally, if you look at the ultramarines, no matter where they are coming from, they will, over time look more and more alike, just like f.e. a clan living in the same area over generations, you will see family lines. as uch as you will see gene seed that is alike. thus you will see the a group of marinses with the same gene seed will look alike. space sharks/carchodons have certain traits that are alike, same goes for f.e. the black dragons or with non functioning organs based on gene seed..

so basiccally if you have a big group of marines with other gene seed, they will look differently, mind wipe or not, they will e visible/ there will be differences to the ultramarines, which will be passed on in their gene seed/progenoid glands) thus you will always have a bsis for suspicion