Kaerukenshi
Is no doubt a S if not S+.
I would pair him with tardi and a third sweeper with double bloodcrave and basically abuse this loophole in the game.
I would go with something like
3 headed shark for the link stealth and purify
Tardi
Zib
A stun absorb
Kaerukenshi 5th
Basically its almost impossible to kill tardi as he will be shielded and stealthed with makes a loophole in the game. Soon enough players will exploit this loophole. And am guessing Kaerukenshi will get nerfed and no compensation to the players.