User blog comment:Crimson and Darkness/Volume 25 discussion blog/@comment-95.210.189.106-20180507172022/@comment-87.4.183.118-20180507221815

Nope. If you're lucky you can RECEIVE a mutation piece, but the others cannot turn into mutation (even Sirzechs had only 1 mutation piece despite being a super devil). Simply they can turn more powerful creature according to how your power grows up. That's why Rias could turn Rossweisse with a Rock piece even if she was very powerful, because Rias power grew up. The fact that a piece becomes a mutation is related when they are already used to reincarnate someone and that someone because so powerful that the piece which turned reincarnated them turn itself into a mutation piece to withstand the power, nothing more.