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Joe D.I would most definitely categorize CYAN as a light blue.
As far as the color variances.... even with the correct ink on press - especially in the beginning of a run.... you can run colors light and heavy.
A pressman's adjustment - using the same ink and the same plates can make for very different results.
I would guess the variances here are from 'waste sheets' that should not have made there way into circulation.
Or, as Ted mentioned, maybe just sloppy press work.
edit to say: Ted - bring the Billy Johnson cards to Philly - they are the most compelling of the bunch.