I know the answer to one of those questions.
Year one legendaries will not dismantle for marks.
Luke smith answered this on twitter, but I am too tired to find the post and link it here right now.
English
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Really so we can only use them as infusion materials
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Yeah... I don't think the work for that either, but am not 100% so don't quote me. They sound like they will be glorified trophies at best.