Marquis = Old Django?
I just watched The Hateful Eight for the second time, and also read the 2016 Samual Jackson interview with Huffington (re Django saddle and jacket in movie).
I know that QT originally wrote this as a Django sequel but has given interviews saying that he changed the story mostly because the Eight are all supposed to be hateful and Django was a hero.
But in my view, it still makes sense to interpret Marquis as old Django.
The timeline and ages of those two main characters are correct. Young Django was in the period several years before the civil war and old Marquis Warren was in the period about 20 years after the civil war.
It would have made sense for Django to change his name after he blew up Candyland and escaped with Hilde. Django identity was known to all after he killed Candie, shot up the cowboys and was supposed to be sent to the mines. He escaped, killed the rest of the family and blows up Candyland. But the neighbours, friends, townfolk who attended Candy's funeral would have all known about Django, who had already killed an important man in the community. And in the end, he also left slaves alive who witnessed him killing at Candyland. Django would have been infamous and would have been a hunted man at least in the South.
It would have made sense for him to adopt a new name. The name Marquis evokes aristocracy in my opinion. Remember the first outfit Django chose? The ridiculous blue boy outfit was also aristocratic. His choice of a new name seems to be in character.
The fact that Django/Marquis continued to be a bounty hunter is obvious.
It would also make sense that Django/Marquis would fight for the Union army. He rather enjoyed killing white racists from the South. He was so good, he rose to rank of Major.
Samuel Jackson has stated in Huffington that the saddle on the 3 dead bounties at the beginning of the Eight movie belonged to Django. Some have interpreted that the dead black man in the pile is Django. Why would Marquis take the saddle of a dead outlaw? It makes more sense that the saddle belonged to Django/Marquis. It is his sentimental possession and he makes a point of keeping it along with his valuable bounties in the midst of a life threatening storm.
In the same interview, Samual Jackson also says Django's green jacket is lying on the floor. Was this just an obscure trivial homage or something more significant? How does a jacket last seen in Mississippi end up in Wyoming? Seems simple in my opinion. Django kept the jacket from the first movie. The fine burgandy outfit, which probably belonged to Candie, was worn by Django at the end of the first movie to piss off his tormenters. But it would have made sense for Dango to keep his old tough jacket to use on the trail. Years later, he goes to Minnie's Haberdashery. We know he has been to that Haberdashery many times, gotten to know the folks and eaten their stew. It is conceivable that he had a new jacket made at the Haberdashery at some point and discarded the old jacket there.
The Lincoln letter is consistent with Django/Marquis' character and storyline. Django had learned from Dr. Schultz that he needs to play a charade to get things done. The letter is a fabrication that he used to impress others.
Did Marquis really get Smither's son to suck his dick? Maybe yes or no? But the main point was that Django/Marcus really enjoyed provoking racist white men... and killing them.
Personally, I did not find Marquis all that hateful even though QT states that all the main characters in the Eight are hateful. BTW, does hateful mean they are full of hate or to be hated? However, just as an evil man can (try to) become good a la Jules in Pulp Fiction, a good man can become evil over time a la Django/Marquis.
In the end, Django/Marquis finally gets castrated. If you view good Django as a man who becomes the sadistic Marquis who enjoys killing whites just a little too much over the years, this would be karma.