"He's even the same height as Aqua, anyway..."

Pieyon (Aqua, CV Otsuka Takeo) did run 10 laps on the slope with the girls. Something that would be in line with what Pieyon (Pieyon, CV Murata Taishi) would do.

Dude method acted so well their brains probably rewrote their memories of actual Pieyon.

At least 40, he's so dang buff, I would not be surprised if it was more like 60. Aqua looks like a stick, so I assume he's around 120lbs or so.