We don't need a panel showing that it was a one shot, Gildarts himself stated that the fight "ended in a moment", that implies that it ended before Gildarts could even comprehend what happened, likely faster than Serena.unless you show an on panel one shot of Gildarts by Acno, it is just vague statements.
Do you mean when Jellal put up that barrier? Acnologia was far from serious, the Acno that gutted Serena was serious. The Acno that was in front of Erza and Wendy was playful, he was laughing when he threw the attack, when he gutted Serena he was stoic, he got right to business, he was a man on a mission. If he was serious Wendy would've been gutted before she could even react.He was serious and confirmed stronger in the final arc which Jellal managed to block his attacks.
If Acno was serious Jellal would have gotten the Serena treatment, if Acno took anyone in Alvarez seriously like he took Serena, they would have gotten the same treatment. The only thing saving Zeref from getting the same treatment is his immortality, Acno would just keep gutting him for fun.And yet when Acno was attacking when he is more powerful than when he destroyed Tenrou Island and someone blocked it, that raises a lot of questions, especially that someone is weaker than Gildarts.
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