Yes that's correct, lots of youngsters carry false colouring especially in their flights, like partial white flights that always disappear in the first moult
My brother has shown Budgerigars for 50yrs, The number of times I'v 'phoned him and his wife has answered saying, I'll give him a shout, he's down the bird-room, I don't know why I haven't got my chair down there, It's the warmest place here