User blog comment:B214/Volume 21 info & spoilers/@comment-50.139.232.230-20160428163740/@comment-24.113.129.70-20160428195745

Maybe Regulus Nemea doesn't have the same kind of "curse" as the Boosted Gear and Divine Dividing. The BG and DD are sacred gears that have had many possessors suffer tragic lives due to having the power of the Two Heavenly Dragons. This resulted in all their anger, hatred and sorrow being made into a "curse" that would activate when you unlock and use the Juggernaut Drive, making you go mad and lose control, if you're not mentally strong enough.

The "Juggernaut Drive" and "Breakdown the Beast" both use the possessor's life force as a power source, but the BG and DD are the ones that have the "curse" that makes you lose control.

If you are under the impression that the life devouring effect of the Juggernaut Drive was only because of the curse, and that's why that issue was solved when Issei and Vali unlock their "Cardinal Crimson Promotion" and "Empireo Juggernaut Overdrive," I don't think that's the case. When they erased the "curse" and unlocked the CCP and EJD, they just "invented/created" new forms that consumed their stamina and magic/demonic power at a faster rate. Sairaorg has not done that... at least not yet.