Anyone who thinks Tolland could take Osiris doesn't know enough of the lore.
To land is/was powerful (he's technically dead), but Osiris is THE Warlock. Not A Warlock, THE Warlock.
The only reason Ikora is Warlock Vanguard is because Osiris left, I mean c'mon.
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They wouldn't dare put Toland in as Vangaurd cause he was insane, doesn't mean he wasn't more powerful