The way most teams work is the head scout puts together a ranking list, generally rounds 1-4 or so. The ranking list has heavy input from the other scouts as nearly every position is debated (and usually many times).
The GM comes in when the list is nearly finalized and generally has a few questions ("why this guy ahead of that guy") and the scouts then justify the order to the GM. There's some rearranging of the order at this time, too, if the GM has a valid point.
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