User blog comment:Miskos3/Fairy Tail Chapter 367: Jellal vs. Oracion Seis, Review/@comment-5268982-20140117180324/@comment-7418318-20140117193831

If Sayla conrolls only the body, Bickslow wouldn't be able to do anything, since he controlls the soul. And even if his and Sayla's magic work through similar methods, the question is if he'd have the necessary strength to wrest control away from her.

Unlike with Laxus (who took the brunt of Tempesta's particles) I could imagine Bickslow joining the fight, but I seriously doubt he'd be at full strength, which would make it even harder for him to overpower Sayla's Macro.