Having a team mate winning the championship more likely underlines the fact that Mercedes have been much better than the grid for all of the years of utterly dominating in that era. Not just an advantage, an absolute advantage, a different sport. Nobody is undermining Hamilton's historic abilities, but I think it is fair to say he has been driving a much better car and that many of his wins have been easy in that regard. If Hamilton drove a Red Bull and somebody else drove the Mercedes, he would not have 100 wins, simple as that. Between 2010 and 2013, Hamilton won 11 races. In 2014 the new engine system was introduced and he won 11 races in one fecking year, it goes without saying the car was smashing all others, not his ability alone.
With that being said, nobody can take his wins from him and he will always be on top of the charts, no matter how lucky his timing has been in the history of things. He has more wins and as many championships as Michael Schumacher, but I would never put him on top of him in terms of true racing ability. Schumacher was up against Hakkinen and the sorts, Hamilton has won tons of races on "bad" days just because his car was still faster than the next best and then some. On a good day, he just had so steer it past the finish line and win by default. Not anymore though, he is old and his car sucks, hence he is completely irrelevant and next season he will probably make way for a younger and more hungry driver.