User blog comment:B214/Question and Answers 6/@comment-185.112.105.215-20161030213317/@comment-9595671-20161030220809

Yep, and worse is that it's their own fault. The series has shown quite a bit that a lot devil family powers are genetic. Sairaorg not having it really bit them in the butt.

Yet they may have also saved their kind by extension due to the power Sirzechs had been born with. He'd probably still have become a badass but not as much of one.