Supernatural season 14 episode 2 Gods and Monsters

First, the obligatory SPOILER WARNING!!!  You have been warned.  ;)
Also, I'm going to ramble about things beyond the episode here.  So please bear with me.

Supernatural theory time: 'Nick' is actually Lucifer just pretending.

This is a theory for Supernatural season 14 so... consider this your spoiler warning for everything up to SPN s14e1.  :)
(Also, this theory is in its early stages, still a work in progress.  I have a lot of scenes to rewatch to work out the details.  So bear with me please.  :) )

Ok.  So... in the s14 premiere,

Supernatural season 14 episode 1 Stranger in a Strange Land

SPOILER WARNING!!! for Supernatural season 14 premiere.

Ok.  On the heels of a great season 13 (though I had some issues with the last 3 episodes...), the start of season 14 left me with more questions than answers.

One of the biggest is probably: