professor Hurts has the best winning percentage for the number of games played.
Not sure how you do not see that he does not. A few others have a higher % 'for the number of games played'.
Now, if you want to change your wording of the statement, feel free to do so.
If that means you want to compare their(Mahomes/Hurts) 1st 75 games, which is all Hurts has, you are still wrong. If you do career, you are also wrong.