Yeah, why would there be a difference for expected Piccolo? I think it was more delusion on Goku's part than anything to assume his blast would do anything. The beating he just took from Piccolo was the hardest beating he had taken in the series.
Yes, but this happens every single blast.
So how do we differentiate between delusion and someone actually powering up.
Raditz, for instance, is probably an example of a power-up.
Raditz Power-Up > Raditz ~ Kamehameha
Or something of that nature. So it may be an individual thing.
Imperfect Cell vs Light Grenade, Piccolo seems to get a good sense of Cell's power, but he's still absolutely shocked by the Light Grenade. Is it because hd doesn't know the true depth of his power, or is he just shocked at how little damage he caused?