Board Thread:Lore Discussion/@comment-97.81.240.58-20130530203219/@comment-9887604-20130603131751

On the topic of dragons getting into Sovngarde, the portal in Skuldafn seems to be a back door in, so I don't think the normal rules of entering the domain apply. However I think its worth noting that Sovngarde is the realm of Shor/Lorkhan who is the patron of humans in nord mythology.

On the legendary dragons, there are a few reasons I could think of for them being more powerful then alduin. First Alduin was banished in the merethic era, while other dragons survived. Certain dragons could have had many years before being killed to increase their power. Also even if the legendary dragons are stronger their souls can be absorbed, were as Alduin's soul can not. He is tied to the world, as he is tied to akatosh and time itself so the other dragons may have deffered to him knowing that he could never be defeated until he devours the world.