Ah but you forget, Zovaal isn't
True Death™, he is merely a cog in the machine that is the Shadowlands. Elune spoke directly with his hitherto unknown manager.
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True, most of the quotes have found pretty good matches over the years.
But, I'd argue, there's a case to be made that many - if not all - have multiple meanings and are applicable to different people and events.
For example Oggmot's note about a dark lady wrapped in black swirlies, leading people like sheep to their own doom. Fits both Sylvanas and Xal'atath pretty well.
The one about the arrow finally hitting its mark, causing the last fetter to fall away, fits Sylvanas attacking Zovaal and Alleria damaging the Dark Heart.
The Lord of Ravens being Medivh letting in the Legion, Khadgar shutting them out, Odyn perhaps doing something soon, etc.
I think the theme of cycles, rings coming to a close, possibilities opening up, etc., which is prevalent in "Old God Speech", is pretty interesting. It almost seems to suggest that they are telling multiple stories and prophecies at once.
Things that will come to pass in some way(s), in some places, perhaps on multiple occasions. With an ultimate, final layer that speaks more directly of the end of the world, through Midnight and the dark looming threat from below the earth.
That said, my OP was obviously just me spitballing for funsies.
