My take is very simple: Galleys describe VERY wide variety of shps in antiquity, cogs are vessels of Middle Age and they can represent Longboats in that regard. And, as a general rule: it is ok to start with units you cannot produce yet because of tech or resource, but it is not ok to start with obsolete unit. Starting stack represents the initial momentum which made the civ noteworthy and present in this mod in a first place. Starting stack is the statement: after many years of prehistory this kernel of Viking energy appeared on the map and sprung into action. Even if some units are a little bit ahead of their time, like those 3 Huscarls, I can see the sense in it. But I don't see any sense in starting with already obsolete units which I can upgrade during the very first turn. Things like this imidiately tell me -- this is not by design, just an oversight I have to swallow and carry on with my start...