Haaaaaaah.....
TL;DR: Don't worry, this is just me ranting and a lot of it makes little sense. ;w; I'm just frustrated with Zeno, my darling favorite character.
Welp, my predictions fell short on account of that one thing that I never anticipated: Zeno has not experienced any actual character growth this entire time. With the exception of Yun, the only one he really wanted to say goodbye to, he does not consider the thoughts and feelings of those around him.
That's really sad.
He's behaving like he's not considering the dragons here and now, but the weight and pain of the past alone. He believes the dragons who gave their blood to create the dragon warriors were selfish, he's seen the pain of countless generations under the burden, he himself has experienced physical and mental agony time and time again and has chosen to forget and disconnect rather than repeat that situation. The poor guy is so done, he can't think of others outside of lessening suffering. He seems unable to understand Hak and Yona's desperate last ditch attempt to get through to him - he even thinks they're angry with him! He would need generations of therapists to help him.
But I have to side with Hak on this one - Zeno did everything one-sidedly. I may understand his position, (past dragons refused to "participate", so why wouldn't these dragons?) but his execution leaves something to be desired. He's been dropping hints this entire time, sure, but that's not coming clean about a problem or the solution he plans to pursue.
Before anyone else says they side with Zeno, let me say one thing: this is not unlike a double(quadruple?) suicide. Different circumstances or not, he's still making a choice for others that they had no say in.