In the Echo Chamber strike the goal is destroy Theosyion, The Restorative Mind before it can revive Sekrion, The Nexus Mind. We do of course and everyone gets a gold star on their report card. However in the revamped Nexus Mind strike Sekrion is back and Takenated. Since it is generally accepted that the chronology of events in the story is in the order of which content is released this means that after destroying Theosyion Sekrion was restored anyway. So then what did we accomplish by killing Theosyion? Was there just another Restorative Mind that did it? Is Echo Chamber not canon because it's not on Xbox?
The idea of there being [i]multiple[/i] Restoritive Minds is disturbing.
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It's most likely canon; Bungie just hates its Xbox community.