On the 2nd bit.
Elliot's therapist: "You know what I'm thinking about? First time you came to me. I know you're not yelling like before which is good, but I can tell you're still holding onto it. We need to work on your anger issues Elliot, you're angry at everyone... You're hiding again, Elliot. When you hide, your delusions come back. It's a slippery slope."
That's from episode 1, there was an Elliot that was angry and vocal (so much so he had to be ordered to therapy?). Presumably about how much he hates society. The Elliot we meet is an extremely repressed Elliot that has barely raised his voice the entire season (except of course, the last 2 episodes where everything has fallen apart). We're introduced to an Elliot that is hiding. Then Mr Robot appears.
The source of his anger and motivation would be his dead Dad and this is the sole literal function Mr Robot has served throughout the season. All he's done is be angry and push Elliot into doing things. I think it's a manifestation of the crazy side of Elliot that wants to get shit done that he's tried to bury for whatever reason. Seems like he had an incident that pushed him over the edge and we come in some time after.
I know I love a show when I can write paragraphs about it