Board Thread:Questions and Answers/@comment-32556318-20170712153049/@comment-36009152-20191123164944

If Yu were born with the seraph gene, or had it activated from a link to the past Yu, either way Guren certainly recognized an asset to help change the world Kureto wanted to make. Guren would not rule with Kureto, taking him down and the Hiragi family with him is one of Guren's driving forces. It's thanks to Guren and his plans why it's likely the Yu we all know best had the gene introduced to him by way of experimentation, just like other children. Then again Yu may be a special case with the past Yu also existing which was decidedly seraph like.