@htTweets regarding this article of yours I have a fan theory. I didn't miss the point, but you missed something more... https://www.hindustantimes.com/hollywood/avengers-endgame-made-this-massive-doctor-strange-error-and-no-one-noticed/story-oQAsGdzO4AhpGK898dipiJ.html

She also said that there are many alternate realities. So unless she was able to make Dr. Strange shed off his arrogance, he'd not have become what he did in the end. She abandoned him to shed off his stubbornness, arrogance & ambition so that he doesn't take the wrong path.

Her shunning him away made him realise it and so he ended up becoming the sorcerer supreme. Had she not done that, some alternate future would have happened.
Now coming to the point of conversation with Hulk. When Banner tells him Dr. Strange handed over the stone, it's clear

That Strange has already become the Sorcerer Supreme. So the reality where he becomes the Sorcerer Supreme has already happened. Hence, he is meant to be the best of them all.
Hope you read this thread and get the point from a fan.