Good point! You’re right, I forgot about that.

My theory was based on following whatever rules Nolan laid out, so you’re right, that line undermines the Limbo part of my argument.

But my biggest point, about Mal showing up in non-Limbo dreams, still holds.

As for your question, Cobb’s indifference to the top totem at the end shows that he’s moved on from his focus on what’s real and what isn’t. He sees his children and he’s happy. That’s enough.

I see that moment as confirmation Ariadne successfully helped Cobb get out of the labyrinth he constructed in his mind. He’s been lost in grief and second guessing, and now — whether right or wrong — has found peace.