Interesting, I think I disagree with every point you made.
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Twice the air flow per square foot of radiator frontal area, plus all the turns, will restrict air flow and cause cooling problems on hot days.
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Three times, but no, the flow will be low, but it's unlikely it will be a problem for ecomodders.
Restriction has to be added anyway, it might as well be at the radiator as at the grille opening. (Clean vs dirty air filters and all that.)
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Better to put in an oversize radiator.
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Like I stated, the radiator is already oversized, and most cars won't fit a bigger one anyway.
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The larger radiator will give better air temperature rise, which will give the same total cooling using less air.
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Opposing flow heat exchangers give the highest physically possible temp rise, multiple passes from cold to hot side of the radiator will approximate that. All that air passing through the colder side of the radiator only, would not get very much heat rise.
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Less air through the radiator is less air drag.
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Ok, this I agree with, that's why I think it's best to heat all the air as much as possible.