“One looks like a chevy aveo, which is actually built and designed by daewoo.”
The Corsa and all other Opel are designed in the Opel Design Center in Rüsselheim/Germany, Chevrolet adopted the origin design, adjusted it for the US market and called the car Aveo.
“I really doubt if any of the others are true opels either. except for the last one.”
What you mean with “true opels”? Dont you see the “Opelblitz” signs on the cars?
Go to wikipedia and do a search for chevy aveo and see what you get.