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Almost no thinker, researcher, experimenter, or scientist at that time could see the true nature of electricity, electromagnetism, radiation and subatomic particles, because the whole picture was hugely unintuitive. Waves, force fields, particles of atoms did not make sense (and still does not make common sense). It required sophisticated mathematics to truly comprehend it, and even after Maxwell described it mathematically, he found it hard to visualize.
I expect the same from intelligence. Even after we identify its ingredients, the emergent properties they generate are likely to be obscure and hard to believe, hard to visualize. Intelligence is unlikely to make common sense.