Can't tell you specifically about Raffles lines, since my breeding"career" was in Germany and his influence was very rare there, but im pretty sure that anything heavily inbred to one ancestor well produce problems. We had Hadban Enzahi standing at Marbach state stud. He was so heavily used, due to lack of alternatives at that time, that they started having severe pigmentation problems. But Marbach was clever enough to see that and they went to Egypt and bought an outcross, the black Gharib.
Or Nazeer, for some time you could hardly find any SE without Nazeer lines. Or the Minstril, for that matter
Inbreeding and linebreeding is an art, and if you do it wrong problems pop up.
Too much of a good thing will turn into a bad thing.
Posted via Mobile Device