Is the vote still one? If so...
[X] Demonstrate Massive and Total Remorse
[X] Withdraw from the Tournament.
Firstly because a) we genuinely feel remorse over killing an opponent in what should have been a non-lethal match, and b) it's far too early for a civil war. I believe that causing a civil war this early would be an utter disaster for the Realm and Creation.
Whatever minor advantage pretending we did this on purpose would give us, it would be insignificant compared to what we'd loose by being thrown into that mess while were not yet prepared. And we aren't. Not yet. You want a spectacular opening for the civil war to come? We can simply manufacture one at a time of our choosing, rather than be swept along with absolutely no control over the situation by a frigging accident.
Except that we really can't.
There's only a single Polemgaos in the Realm and noone but Zao and Big Red could be said to be his superior in combat.
Chances to give a similarly intimidating showing of martial prowess will be unbelievably hard to come by and will almost certainly not benefit from being nearly as public, blatant and undeniable, regardless of whether future feats of ours should technically be more impressive.
Not to mention that as Uly becomes a known quantity anything he accomplishes becomes a lot less shocking. Zao's apprentice, who's reveal came out of nowhere and whose existence people weren't aware of before then absolutely slaughtering the third strongest DB in Realm history, a veritable living legend, in his absolutely first public showing has the potential to have an unbelievable effect on any onlookers.
Even beyond the sheer shock value that we'll never get again, people will be incredibly anxious when they think abut what else Zao could have up his sleeves, because noone saw
any of this coming or even saw coming that Zao was planning to make a move at all, so obviously Zao must have absolutely demolished al their attemtpts to gain intel on him.
Meanwhile, showing remorse publicly admits to our faults which you can be sure the Siddies will make sure to attach to our rep with superglue, doesn't gain Zao any momentum to speak of and gains us an incredibly powerful enemy in the form of the Great House with the greatets military of them all who will make sure to oppose every single move we make from now on with as much force as they can.
Even ignoring legal pursuits and direct assassination attempts, that's a lot of politcal power opposing us from now on and if they really want to fuck us over, which of course they do and the Siddies will ensure they continue to do, they can always fall back on promising someone the Cathak legions if they just help fuck us over, which isn't really an offer we can hope to match. Hell, stuff like that could very well see us finally disinherited, whereas kicking off the war now would pretty much ensure Sesus jumps into bed with Zao's faction.
Given all of that stuff and that this stunt will move us higher up on the list of targets to assassinate that all the factions hostile to the Realm have which will take attentiont to ward off, it is very questionable to claim that we can in fact make up for this blunder and gain momentum equivalent to the one we'd get from kicking off the war now and it's basically a certainty that if we do manage to make up for it quite some time will have passed, which is time not spent on using the Realm's resources to oppose the actual threats to creation, time for our enemies to advance their schemes and time for more and more of Creation to be irrecoverably lost to all the threats currently out there.