There’s one problem remaining with this ice crystal theory. Zane’s power source was destroyed when he died.
Here’s my theory to explain how he retained his ice power in Season 4:
In Ninjago: Shadow of Ronin, Zane visits the Frozen Wastelands to get his Obsidian Sai. As he aproaches them, he sees a memory of himself being captured in that same location by Ronin. Since this was where the Golden Shuriken of Ice had been housed, it’s possible that Zane had somehow recovered his ice power there, just before Ronin’s ambush.
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