Peter,
the advantage of the furler to me is related to the fact that the code zero is big and has a large overlap. Hence, furling with a standard drum ( is this a Barton?) would require quite long sheets, which stay in the way and add to the (possible) mess. And one would also need a drum of a big enough size.....
I hope this answers your question correctly.
Guy
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Catchando Bay (BR#48)