Ha-I had not thought of it but in terms of the comic book world it certainly fits. I am not sure why they added that second story. I do not think it has any relevance to the main arc but it was worthy of entry. Kind of reminded me of the old back-up stories in the old Avengers Classic mode. It was too short for any real analysis but it is interesting that Thor represents the old dying gods where Arthur represents the the coming of Christianity as the new way. The new still has some roots in the old. More likely it was just a way to fill out the last few pages.
But at least we got to see a young King Arthur try to lift Mjolnir. Never thought I would see that story happen. It was the only real highlight of that issue for me tbh. Interesting how Alex Power was able to lift Mjolnir but young Arthur wasn’t. Then again I doubt that old Power Pack story was canon.