Hi Jen,
Yes I will admit that the scene with the explanation seems somewhat clumsy, but for lack of a better explanation the director probably thought it was an ideal scene to end with.
You must remember that studios in those days limited production to only so many days, and or, so many feet of film to be shot. It's quite possible that's why they ended it like they did. If Matt had gotten healthy that would have led to increased production and as everyone knows studios were hard pressed by WWII to stay in the black.
Regards
Ethan