I think he can be an amazing parrot with the right training & rewards. Parrots just love getting rewards for what they're doing. I would'nt count on him ever being a cuddler though. Most ''hot threes'' don't usually like being cuddly. (there are exceptions), But he can still be very tame and behave very well. Just take it easy, and do whatever is best for the parrot and yourself. Try constantly reinforcing good behaviours with treats.
My Female OWA Kiwi shows much more territorial agression than my female BFA Kiki, and is alot more ''selfish'' and reserved. While Kiki shows interest in everything and never shows any sign of territorial behaviours so far. But Things might change when they mature. Or they might get worse.
All Amazons differ very much in how they are and how they behave. Not everything can be fixed, but most/all behaviours can be fixed.
I wish you good luck.