I don't think this captures the whole situation. Much of what makes comprehensible input comprehensible, at lower levels, is presence of visual hints.
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Much of the beginner videos make use of visual hints like you say (images, props, etc), and none of these were taken into account in my analysis.
I do think it could be cool to do a 'visual' analysis of CI in the future where you attempt to measure how much context is present (or not) in each video and see what insights you could draw from that.