You'll have to ask the OP. Draisaitl came into the League as a pass first, pass second, pass third kind of player. He actually reinvented his game to complement McDavid. I remember watching the two in warm-ups practicing one-timers from that extreme angle with McDavid feeding Leon and the net empty thinking this is something very interesting. Over the next few years it became a key to the pp. But it was not something he came to the team with in his tool chest. At least if he did he never showed it in his first two years nor do I remember anything like this from his junior days.
Leon is absolutely capable of playing center at the highest level. He has been one of the league's best faceoff guys for years now. Right now we are seeing how good he is defensively with him been asked to play a shutdown role vs the opposition's best players. He did a great job vs Eichel for example. But as his game has grown he remains a fantastic playmaker. It is more obvious when he centers his own line but even with McDavid where he focuses more on finishing he still makes great passes all the time.
Draisaitl's ability to reinvent his game to complement McDavid is something he does not get nearly enough credit for. In the comparison with Thornton, who I think was a fabulous player, I do wonder if he had had the opportunity to play with a McDavid, could he have done the same. My guess is no.