Should Zeno have saved the White Aura potion at a more crucial time?
Sure.
Unlike his other items, it was a one-time use only, and it would have been a game changer on the bigger stage.
However, he felt that if he didn't use it now, there might not be a better opportunity for him to use it at all. It was now or never for him.
Zeno also didn't consume it at the beginning of his scene because he knew the others were underestimating him. The moment he captured all of their attention, he finally used the potion, and let's just say that Zeno had made the right decision.
"Is he… glowing?" Risa muttered.
Daeshim, too, stood straighter as he looked at Zeno. There was a sadness in him that felt he had truly embodied the character. Along with that, a white light seemed to shine behind him, so he couldn't look at anybody else. And of course, the cherry on top was his actual sickness, which made him look ten times more pitiful.