You said 15 points difference wasn't possible while playing with the best player in the game and getting drastic TOI advantages, which is untrue.
Uh, your opinion doesn't count as proving it untrue. I didn't see a single piece of actual evidence that you provided that suggests playing with McDavid bumps a player's totals up 15+ points over what they're otherwise capable of.
McDavid's regularly played with other wingers other than Draisaitl. I'm assuming you have the evidence to show that they've produced 15+ more points with him than they did at any other point in their careers without him?
You also made some claims about Tavares and the impact an elite linemate had on him, which I proved to be false.
No, you moved the goalposts to only include those rate stats that you stick with. Just because you don't think raw totals have any merit doesn't mean your point is correct.
Fact: Tavares' career high with the Isles was 86 points, which he got in a much lower scoring season. His new career high is 88 points with Toronto, which he got in one of the highest scoring seasons in the past decade.
You have this tendency to state things as "untrue" if they don't follow your own specific idea of what stats matter or don't matter. It makes having an honest discussion with you difficult because you'll dismiss outright everything as "untrue" that doesn't involve your fascination with "rate" stats.