Yes I absolutely agree with what you're saying. I know these are amateur bums and that they're gonna tend to admire their work.Because Hachiya was out of position and couldn't recover his stance before Aoba kicked him with what Hachiya's corner woman mentally refers to as a prepared (I.e. drilled) sequence.
It isn't, Hachiya just made a mistake. He threw himself totally out of position with an overcommitted right hook.
Firstly this absolutely can happen (it's called taking a picture of your work) but Hachiya's position is entirely off, he's almost carried himself completely past Aoba if you look at the shot of when Aoba actually kicks him. People throwing themselves out of position and getting caught is absolutely something that can and does happen in MMA, Hachiya doesn't use a fundamentally sound striking system it's based on his attributes.
Listen man, even if Hachiya is out of position, think about the power he put into that lunge. How is Aoba meant to counter him that fast with a high kick after being knocked around by that punch?
Since we're going purely off hypotheticals, we both know Aoba could have simply feinted the right hand and thrown the right kick, this would have caught Hachiya as he was lunging and KO'd him clean. This should be doable since he knew ahead of time how Hachiya reacts to every straight right hand apparently.