Gustave did not die...Zero did?

Hello, watched GBH several times and every time i think about the whole "why doesn't 1960s Zero look anything like 1930s Zero" thing.

Maybe this has already been resolved - in that case - disregard this post.

My conclusion is that the Zero of 1960s is actually Gustave.

My reasoning is this:

As Zero (FM Abraham), who i believe is actually Gsuatve, recalls the story to the author during dinner - he tells the glorified version of the story, where he, Gustave, is a glorified version of himself - better in every way than the real thing (L'Air de Panache).

This is why FM Abraham-Gustave looks nothing like Fiennes-Gustave - Fiennes gustave is how he thinks of himself, how he wants to look, the glorified version - the storybook version.

But why does he call himself Zero if he is in fact Gustave?

A prevalent theme is the bond between Gustave and Zero - they become "brothers".

However during the black and white sequence near the end of the movie - this indicates, i think, that this sequence as the only black and white sequence, is a straight-up lie.
We see gustave challenge the ZZ death squad, threatening them. I do not think he did this - i think he did nothing - Zero was taken of the train and executed - Agatha was taken to concentration camp as she is jewish(birthmark?) and died 2 years later of the "Preussian Grippe". Gustave betrayed his friends in a sense.

Because he did nothing - he is now left with a huge "undeserved" fortune, with all his friends gone - and he regrets his inaction and he "dies" metaphoricaly at this moment. And from this point on takes on the persona of Zero. Also note that "Zero" lives in Gustaves cramped quarters at the Hotel.

Does this make any sense?