Spectrum, no doubt
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The immortal Iron Fist is absolutely canon, as it continues where Iron Fist: The Living Weapon 2015 comic ended, with Danny taking Pei as an apprentice
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Remember though that continuity, specially with old comics as this one, doesn't mean that everything that happens there happens exactly the same in nowadays main continuity... Since then many retcons has happened, and also there is the topic about Marvel time (the comics happened in 1963 in those comics, but when those facts are remembered now, they are remembered as if they happened in about... somewhere in the 2000-2010 decade... But that is always how continuity in Marvel works! or Peter would and old man)