Space Marine Supreme Commanders are listed as having Supreme Commander and Leader.

Since the Supreme Commander special rule means that the character counts as having both commander and leader, is the reference to leader in the summary redundant, a mistake or does he count as having leader twice?

The Commander rule is not listed in the summary, so why is leader?

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Industrious, red-robe wearing member of the PCRC

Leader does not count twice on the same unit, it's effectively a typo.

It's in the FAQs that if a unit has a special ability twice (like stacked Leader and SC) it only counts once.

Fantastic – cheers for the clear replies

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Industrious, red-robe wearing member of the PCRC