Do you have any archeological evidence that the Pomeranian merchants ever entered the Novgorod & Volga waterways?The only reasonable theory is that if Rurik did come from abroad and was not a Local - then his birthplace was none other than Reric - a culturally Slavic stronghold which was a Viking centre so they could easily cover distances by Sea from Northern Germany to Novgorod.
There is ample evidence of those waterways used by local finnic peoples; since the 7th century there is also evidence of north-germanic varjags, who got that permission from the locals by some successful raids. To my knowledge there is no evidence of any Pomeranian presence at the Novgorod & Volga waterways in the interval of 7-9th century AD.
You should educate yourself some more:I can much more easily sea linguistic connection between Rurik and Rerik, than what the Normanists suggest and somehow connect that Rus borrowed the name and came from ROSLAGEN, first of all the place ROSLAGEN was never even found to this day - nobody knows what geographic location this even refers to
The name of that region in the finnish language was Ruotsi, in estonian it was Rootsi. In both countries that name eventually came to designate the whole Sweden.
The name comes from the baltic-finnic word "aeru(t)si" = "by oars".
The earliest known Baltic Sea longship with a keel (and a sail) has been found in Saaremaa (Salme).By they way the longships which were used in Kievan Rus are an exact copy of the Slavic Obotrite viking ships they used in the Baltic, it's different from Scandinavian!
It is also known that the ship technique of baltic-finns was a bit different from the scandinavians.