User blog comment:B214/Question and Answers 6/@comment-2607:FB90:603D:5340:4082:7A47:2AEA:26C5-20190115200556/@comment-10330822-20190117130757

Well, seeing as he can reach Breakdown, I really see no reason he can't reach Abyss Side. The question is if you use both, is that hard? One would think its not just like he's adding on Abyss Side, it's probably difficult immensely in and of itself.

However, I kind of agree, even if Regulus is loyal to Saiaorg, and is his Pawn. I find it kind of odds they can fully simulate the bond between user and Sacred Gear. I mean, there should be some kind of handicap you'd think.