Yes, it can be from GS, of course. But I think no, because here we don´t know some case of it. And in czech are only pure breed csw. If was some case by saarols breed, My personal meaning is- it can be in some "not so much clean"
breeding.
So I think, will not be situation when we will must give some line out from breeding....
But-I told, in this moment we can only think about it. We (me) don´t know where Mijke have seen it.