Mainstream watered-down console-loving kiddies you lot are. Anyone worth their salt knows that the Secunda Moon Colony RTS was the only decent game in the series.
Touche, but my RTS allegience goes to C&C's made pre-2000.
Besides, SMC-RTS had a pretty lackluster interface, not to mention that every few minutes you'd fall through the map (though that might have been some comment on the deterioration of the lunar surface).
On topic: Considering that they did acknowledge the staff of chaos' destruction as one of the factors that brought about the return of Alduin, I wouldn't be surprised if the similarity wasn't a coincidence. Pity Alduin's wall didn't play any real role in the narrative.
Really, where's it mentioned as destroyed in-game? I don't recall it, and the end of Arena leaves it completely ambiguous.