Pagan is not equal to Primitive. These Germans have adopted Late Roman tactics and underwent later similar changes as in Ottonid Germany, which means there's not a huge differente in warfare between 1066 Germany and Lux Invicta 1066 Thiudenland.
This is not true. The most heavy-cavalry abusive age in Europe were the Middle Ages, and they lacked precisely strong central powers. The lack of strong central powers was the main condition for the rise of feudalism, but this did not stop the rise of heavy cavalry as the central piece of the battle's organisation.
There's nothing counter-intuitive to the concept of a German federation of tribes-turned-empire in which cavalry plays a strong role both as sign of status and an effective smasher of enemy lines.
Ok,that makes sense. Did not use the term centralized powers in the more modern meaning of a strong state, meant more as opposed to the even more decentralized tribal structures. A duke in a feudal realm had more centralized power I think than a leader of equivalent status in a more tribal society, might be wrong about that as well too though.