Glad it's not just me then, that's why I initially wondered if the requirement of the pump for 1+ was just a sales tactic on the website and not essential.
I think the bottom line is that it's not immediately obvious and normal logic would suggest that stage 2 would need all the hardware of stage 1+ and something else.
You'd naturally assume (or at least I would) that going up a stage numerically would mean more power, resulting in the requirement for more hardware than a lower numbered stage.
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