Didn't orochimaru know the edo-tensei jutsu? Why did he use the hidden sound and sand. Couldn't he have just summoned the third raikage and wrecked everyone?
Orochimaru was not perfect at using edo-tensei .He was only able to call third kazekage that too failed.So I think he preferred not using edo-tensei.
Even kabuto took a lot of time after Orochimaru's death to perfect in using it.