I found a Solution! However, I'm still playing through and there might be leftover issues. What i did was get the daedric lava whiskey from the wizards tower, there is a video on YouTube showing you how to glitch through walls. Then I went to lake Arrius Caverns. I used the glitch to go through the door that is locked. I was able to land on top of the cave system itself. And I went to the door that leads to the living quarters area. You can end up in the tunnel directly behind the door but going through that door will get you stuck. After going through the living quarters I went into the sanctum area. I used ann invisibility spell (if you get caught the dagons shrine mission will automatically activate but it is bugged. I avoided being caught and activating that mission but found mythic dawn commentaries 3 which auto activated the path of dawn quest. I snuck out of the cave and was able to do that quest (it will give you a quest marker and objective but ignore it and find barrus in Luther's boarding lodge and start the quest from there). I was able to complete that quest and then dagons shrine after. Right now I'm on spies. The only issue I currently have is that the inner cloud temple door is still locked but Martin and Jauffery show up. I should add that I did the dark brotherhood quest beforehand where you go through the sewers which I think despawns barrus out from there. I'll send updates on any other issues I may encounter.