I mostly agree, with the exception of the initializer, something I haven't seen put to much use in controllers. The main thrust of my question was, do you have any links/examples for a DI based rails controller? Other than your "in theory" refactoring?

I do have examples of similar things but I cannot disclose the code as it was written in closed applications. For instance, I am guilty of redoing poorly the java servlet API using servlets.