I couldn't help but to notice that on 1 Ulfric's sound bytes mentions http://www.uesp.net/wiki/Skyrim:Erikur" and proceeds his speech after the invasion of Solitude. I notice on http://www.uesp.net/wiki/Skyrim:Elisif_the_Fair under notes mentions: "Interestingly, Jarl Elisif was originally intended to be the target of a murder ordered by Boethia, called http://www.uesp.net/wiki/Skyrim:Boethiah%27s_Bidding, following the quest http://www.uesp.net/wiki/Skyrim:Boethiah%27s_Calling. The quest itself was removed, but the data can still be found in the game files."
Come to find out that the quest "Boethiah's Bidding" was an unfinished quests that requires the player to kill the jarl of solitude.
Why was this quest labeled as "Unfinished"? It seems a bit interesting, unless if Bethesda decided to add this quest to the future DLC of the dark brotherhood quest? Maybe have Erikur perform the Black Sacrament to get rid of Elisif so he can become the next Jarl of solitude? He reminds me a lot like Maven.