User blog comment:Xilinoc/Ch. 601 - VERGE ON VERMILLION/@comment-7606564-20141016151908/@comment-11051098-20141016165159

I think the fact that Bambietta kept and used The Explode after she died, means that the special power does not go back to Yhwach, only the soul piece and perhaps Reiryôku of each Sternritter. He would become far too overpowered if he received their special abilities as well. He probably has enough power alone to stand up against the RG.