Me @ this English: "I feel you are broken."

The video you mentioned also talked about Karin and Asuka, who are not part of the main story, but were designed by Aoki Ume and have main story ID numbers. If we really didn't want to use Kuroe, Asuka would have worked perfectly in her place, since Karin is too connected to Alina and other main story characters whereas Asuka's connections are mostly with side characters.