Bottas will back Hamilton as a number two, the way Kimi has been doing for Vettel.
You're not factoring in technical issues. Ferrari has been perfect, both Mercedes drivers have had to start from the back of the grid, in circuits that would have suited them. Secondly, Vettel has seen a massive amount of luck (some would call it manipulation) to account for that points difference that you're not including in your numbers. I know we've gone around on this, but you can't discount the law of averages on Vettel's luck holding out for the next six races. Baku alone would have destroyed your math that was a freak and not just on the loss of a win for Hamilton, but on negative tally for Vettel at least a 35 point gap.
We can spin it every which way till Tuesday but unless Hamilton DNFs there is no way for Vettel to win. In 2010, there were 5 people competing for the championship, this year there's only 2. In 2013 the car Vettel had in the second part of that season, was more dominant in every way shape and form to the Mercedes of this new Hybrid era. Neither of those two factors exist. So the probability is zilch.