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"Move throttle from closed to open slowly, then back to closed. Maybe 5 secs"
So this procedure (different from the closed throttle ones I am confused about) starts to make more sense to me. Opening the throttle purges a sacrificial "slug" of hot and vaporized fuel from the lines, into the chamber, and pinches the line back off again just upstream of the divider.
However, given the potential of a somewhat flooded chamber (great or small, depending on circumstances), I would think it makes more sense to stay "cracked" as they always say, but pull the mixture back instead. Then start cranking, and advance the mixture to ensure a healthy firing when the needed mixture is arrived at. Using the throttle to do this would advance both fuel and air, and--I would think--not have the benefit of a lean beginning that transitions to a correctly enriched mix, facilitating a healthy fire up. In other words, as you start your crank with throttle cracked and mixture back, there would be a brief time to un-flood the chamber (assuming there is a flood, but no harm in a momentary lean condition in any case), and then start enriching with mixture advancement.
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