Yayoi can't be compared to Jean. While Jean is a very efficient walling 2s, he still only life gaps 3 (5 with fury) and doesn't usually damage enough to provide KOs. Yayoi is a monster that opens a KO options for Charlie and at the end of the day provides a damage reduction via Clan Bonus. This gives her a variety of roles aside from SOA waller. While Jean has SOA, he still doesn't have any DR abilities. Now if Jean was a 8/1 with SOA and -2 opp damage min 1, this would be a much different story.