Basically I agree with what most people already have said. You need to show hard work and dedication for the server you're applying for and being allowed to go straight back to HA simply because you used to be one before seems both useless and unfair to other candidates.
Besides, if someone resigned then it's clear that they have something going on in their lives that needs their attention. Being so unreliable and yet still being allowed to go straight for the highest applicable rank simply because of past experiences seems... wrong.
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