Just like Dany Heatley would easily get 60 playing with Joe Thornton?
The idea that pairing a great goalscorer with a great playmaker will lead to the best results has never been proven to be right. Gretzky and Hull didn't fit at all, Heatley fared worse with Joe Thornton than a whole bunch of players, the list goes on and on. Sometimes a very good goalscorer who has great chemistry with the playmaker is a much better fit than a great goalscorer.
I wouldn't exactly say that McDavid automatically creates chemistry on his own either. He and Hall didn't look particularly impressive together, and they were clearly the two best players on the team. Crosby doesn't always get paired with the best players, because he will produce anyway, Jagr won scoring titles while playing with scrubs, while the remaining talent played on the second line. Elite talent doesn't need to be paired with elite talent to be successful, and in many cases too much talent on a line leads to less success than having a third less talented player who does the dirty work.