Does each different usage count toward getting the powers?
Can’t say for sure, but it feels like they might.
If so I'm pretty sure if done right one could get enough uses(was it 3 or 4) to activate the sickness scene & powers for all before they take their first long rest. I wonder if you have to do each dream step first or not.
I think patch 8 revamped the ordering of camp scenes. I can’t remember their exact sequence for the tadpole users but I’m fairly sure you can’t skip any steps.