Maybe I am little late for this thread.

I do have Kakuzu EGF from previous Sakura Event for cheap cheap. I don't use him as much in PvP. He's basically in my Ranked battle to support other Akatsuki.

He's not as bad as a lot of players might think he is.

Even extra standard passive on Kakazu's breakthrough is scary. Just look at Jinpachi x Edo Deidara right now, he only removes 1 debuff and gives extra standard to another Edo Ninja, in this case Edo Deidara, they really do a lot of damage.

They perform well in any area.

They might implement his breakthrough, but I don't think we need his breakthrough any time soon.