I also remind you that, according to the developers, the game takes place in the 6-12th centuries
According developers, Sturgia should be kind of mix of Vaegirs and Nords, from which later will form Vaegirs. So, one can easily guess time period on which Sturgia is based (9-10 centuries Rus state) Plus we have only leaked concept art of Sturgians.
dear ...
please read one more time the developers blog about Sturgia. you want a greater influence from the nords in this fraction. But this is not a Nordic faction, nor a mixture of Vaegirs and Nords. For the Nords, there is one mini faction - Skoldebrod. it is in this mini-faction that it will be possible to hire Khuskarlov. So the developers decided.
If you carefully read the Story of the Temporary Years, it indicates that they sent (the union of tribes) overseas, to the Vikings - to Russia. and further clarification is that the Vikings were of different nations, some Swedes, some Normans, Gotlanders, Angles. the place where they came from is unknown, and the island that you cited as an example is not suitable, since its current name appears in the sources only in the 13th century. in Swedish, there is no root with the word Rus, it came from Finnish, Ruotsi - a man sitting at the oar (rowers). Ruotsi - Russia. Until the middle of the 10th century, their influence (the Varangians) was strong in military affairs on the Slavic and not only tribes. Wall of shields, and only foot order. In the center of the army stood the prince's squad, on the flanks of the union of tribes (light infantry). The Vikings used horses mainly for movement. But after the campaign of Svyatoslav in Bulgaria, the army of Russia begins to undergo strong changes. Cavalry comes first. Since the main rival are the Pechenegs. and the wall of shields is losing its advantages, a new military estate appears. Prince's squad becomes almost the entire cavalry. and the pedestrian army remains behind the cities. and this is the end of the 10th century. And not Varangian influence begins to prevail, but the Byzantine-steppe one. also, do not forget, almost all weapons were imported from France, Byzantium, normal ores, there were no weapons for manufacturing weapons in Russia. also, do not forget the influence of the Khazars, who kept half of Russia in tributaries until they were destroyed by Svyataslav.