This. Emet-Selch was a wonderful villain and our adventures on Elpis really put a lot into perspective. He had redeeming qualities.
Zenos has none - which is FINE. What he said to Jullus is essentially how I feel about him - why would him being "redeemable" make any difference? He's laid to ruin entire civilizations, he's committed mass genocide, he's personally killed possibly dozens of people. He wanted to fight, he wanted to die fighting. He got what he wanted. Let the man rest in peace, and if you personally want a redemption arc for him then view his bargain as that redemption: He was willing to save a universe to get a chance to die at the WoL's hand. There.