Well i tried to sort out your problem in every manner but as per my knowledge you cannot have different animations for same sprite until you trigger something and set animation manually. but you can have different frames at the same time. Then again if can get exact logic which you are trying to put here i can be of more help. So far i cleared Sprite3 randomizing Y position issue and though the sprites change animations with every new spawn of sprite2 but they change all at the sametime.
If this didn't suffice you please give us more insight what actually you are trying to do here.
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