I don't know about the behind the scenes stuff but Rosberg retiring was definitely a case of knowing he fluked it and the only way from there was down, it reminded me of when Marion Bartoli won Wimbledon and then quickly retired, after her opponent knocked out all of the best players and then totally choked the final.
I recently read about the stuff he thought Schumacher was getting up to to destabilise him, so I guess he learned a trick or two.
I don't think he fluked a championship though, he was genuinely quick. Both drivers got up to no good. Nico using banned engine modes in Bahrain. Lewis using same banned modes in Spain. The incident in Monaco that Nico was cleared of. Lewis refusing the team order in Hungary (we've seen that before). 2014 was very close. The double points race skews how close it was due to Nico's ERS problem at that race.
Overall it was 2-1 to Lewis. Strange, I always remember Nico having car issues. There were jokes on here that got Schumachers car, but Lewis had the most retirements. The car issues tended to punt them down the grid rather than force retirements.
I think if Alonso was in the Merc car it might still be 2-1 to Lewis, but probably only a few points in it over the 3 seasons.