Nolan asked Joseph to play Inception and Batman, is it because he has the shadow of Heath Ledger in him?

Do you know what Heath Ledger did to play the Joker well? He often locked himself in a hotel room, sometimes for a whole day. In order to figure out the Joker's heart, he learned his smile, including his pronunciation. Later, because he was too involved, he had to be sedated and finally died of drug poisoning. Therefore, it is said that Joseph could not have the shadow of "Joker".