FRK_R23: Ostatně ani bři Coheni si to nemyslí :))
For what it’s worth, the Coen brothers have already weighed in on the Donnie theory. They dismissed it pretty definitively.
During a 2016 interview with The Huffington Post while promoting Hail, Caesar!, Ethan Coen said, “Really? No, I haven’t heard that. But doesn’t The Dude get covered by Donny’s ashes at the end of the movie?” Joel jumped in with, “So what’s in the urn?” When the interviewer pushed the idea that The Dude might just be playing along with Walter’s delusion, the brothers weren’t having it. “You could say any of the characters are imaginary if you wanna stretch it that far,” Ethan laughed. Joel added, “All the characters are imaginary. They were all imagined. They don’t exist in reality. They were just made up for the movie.”