I don't recall it happening since Dragon Ball where Piccolo used his sizing ability to become a giant. It seems like something that should have happened at least once or twice with "Great Apes" becoming a thing in DBZ. Do you think it was just another thing that was forgotten about? It would have been cool to see a Piccolo take on Gohan (in Ōzaru form) or even Vegeta as a Great Namekian.