Auresta wrote...
The last quote is intriguing and in the dreams I mainly took it as quotes from his lost teammates, or those he believes he is affecting. But we can go deeper 
While I love this theory and fully support it, some of the evidence isn't very good.
-The gun. While I and others have said that the gun in the final stretch is Shepard's will power, I feel like that's a stretch now. You have unlimited ammo in the beginning and when it does run out, its for scripted purposes. However, in the final stretch, you do have unlimited ammo, but someone could easily think it would be amusing to shoot the gun for no reason, thus you run out of ammo.
-Illusive Man was able to get a gun: from Anderson. If you notice, Illusive Man reaches behind and down Anderson's back and pulls out a gun. Anderson may have slotted his gun between his back and pants when he was operating the console.
-The dreams. Even in real life, dreams can mean ANYTHING. While yes, it shows evidence of indoctrination, people could argue that Shepard is just really stressed and the shadow figures could represent his own mind, not influenced by Reapers, recalling all the deaths he caused.
-Whispers. I didn't hear Ash's and I left her to die on Virmire. And yeah, the whispers are a bit odd, but dreams are a mixture of memory, desires, imagination, and subconscious thought.