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Exactly.
My old prof, Dr. Fastovsky, was always careful to reinforce the difference between science and what he called "storytelling". Plates and horns may have been for protection. They may have been for display. They may have been both, or sometimes, or just raw chance.
Fastovsky is a world-class dickweed, but he was (and I assume still is) a great scientist, and someone to pay attention to in his field.
It's fun to speculate but we will most probably never know.
Me, I think that the Stego's plates were decorative and the spikes defensive.
-dale
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