Toland is dead, as confirmed by his own messages in the grimoire. All that is left of him is a drifting consciousness that observes the events of the sword space and throne realms. As he has no form, Ascendent realm or abilities, or the power or knowledge to Take, he could not be the one, even if he did somehow get a look at Oryx's Tablets of Ruin
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At current sure. But what if that found its way into the deep and returned? Considering potential character retcons of course. Odds are though it'll be something like malok leading right now. Or its a "time anomaly"