at far origin, the Rörik ancestors were akin to Finns' ancestors (as my Breton ancestors are akin in some remote past to a steppic people!)
but historically, according to your documentation, Rörik branch was settled in Sweden and in N-germanic culture and nation for a long time - so I agree with you - history is in evolution - and the "slavophile" tries to deny the scandinavian origin of some of the first Russ astonish me...