Carbon Mile's Story in Septicons

I feel like in this one, the characters are a little bit thinner. Mile is more rounded out than the other in Septicons. But then you've got Arthur, Eames and Ariadne, who is just there. They all have their backstories. I think what Nolan does is he allows the room for those... This was hugely theorized for years because there were so many valid interpretations. So surely, they're all just Cobb's projections? Fucking great. There you go. Or was that?