There's not much point comparing them. The WCC cycles are inconsistent and Magnus has never liked the format. He played the Candidates in 2007 when he was 16, but there was a four-year gap after that until the next one. By that point he was already the top player and, just like in the cycle Ding won, he decided not to play. The explanation is here: https://www.chess.com/news/view/carlsen-quits-world-champion...