User blog comment:B214/New anime 2017 discussion blog/@comment-97.86.117.132-20161230234256/@comment-1359322-20161231154605

I hope that's not the real reason cause if that's the reasoning behind it, Kurenai as a character would be nothing more but a disappointment. He succeeded Azazel's research, you would expect that he himself would've created several Artificial SG/Longinus, other inventions as backups plan or sort when needed like Azazel always does.