User blog comment:IamJakuhoRaikoben/Chapter 381: Where Demons Live, Review./@comment-24257713-20140418122709/@comment-7418318-20140418125552

If Mira can fully take-over Sayla (on account of Sayla being severely weakened from the beating) it would solve both problems.

On one hand Salya continues to live on inside Mirajane in away, but at the same time she's won't ever control Elfman again.