I asked for a simple thing, gave the reasoning that Sans can end the fight in less than a second, and that it is incredibly IC for him to start off that way due to having a single fight period, and even said I'd vote for Uzi if there was proof her first move was AoE. You haven't proven that, so I'm voting Sans. Simple as that.
Does Uzi talk at all, does she hesitate even for an instant? Does she try to use melee? Does she use stuff that can be dodged? If she does literally anything I just listed, Sans gibs her.
And of course, this is a thing.
Yeah, Sans has one fight. In this fight, if you look at literally any lets play of Undertale that does Genocide, he ******* murders 95% of gamers who have True Flight and can survive over 4x as long as Uzi in contact with Sans's attacks on their first time through with him.
Potato quality but to go through everything that can go wrong... If Uzi doesn't immediately jump she's dead, if she doesn't have true flight(She doesn't) she's dead on the second attack, and if she doesn't dodge the Gaster Blasters properly she's dead.
That is a lot of ways to immediately die if Uzi isn't perfect in her starting move.