Does Batman: The Dark Knight truly fit the monomyth?

When my group got together a few weeks back and racked our brains to find a movie which would easily fit the monomyth rubric, thus not requiring as much effort, we decided to choose our favorite Batman film from Nolan's trilogy, Batman: The Dark Knight. We assumed that due to the fact that this was a simple action movie(one of the best I've ever seen, but an action movie nonetheless), we thought that it would strictly follow this monomyth. To our surprise, upon completion of the film and meeting together as a group, we realized that the trilogy itself acted as the monomyth while each of the three films acted as one of the steps described in the monomyth. Batman: The Dark Knight, the second of the series acts as the Initiation step. Despite having a rather heated discussion with Mr. Farrenkopf during class as to if it was fair to say that The Dark Knight, while telling a story does not necessarily fit the monomyth, I continue to hold true to my belief that maybe not all hero films necessarily fit this monomyth, at least in its' entirety.
As a result, upon looking at what the other groups put in their doc spreadsheet, it is evident that my group approached the monomyth from a different angle as we tried to fit this movie into one of the STEPS of the monomyth rather than smash it into the entire rubric itself.

With the exception of Casino Royale(which is not really a continuation of the other Bond movies), all of the other groups chose a standalone film, which as a result, made it quite easy for them to fit their film into the broad monomyth format. This is because, unlike The Dark Knight, their stories are from beginning to end meaning that the first time we hear of the character to the last time we will hear of the character all occur within the same film. As a result, it is essential for the film to tell a COMPLETE story, thus nicely fitting the monomyth in most cases.

While my group could have probably smashed our film into the monomyth, I am happy that we looked at it through a different lens and as a result we were able to consider that it was possible that not all hero movies perfectly fit this almighty monomyth.