Who decides what your pouch size will be?

I watched a show on Discovery Health last night on varies types of weight loss programs or aids available for obese ppl. There was a guy on the show who weighed 600 lbs. His Surgeon said his pouch was about the size of a thumb. One of the Surgeons I spoke with said it would be the size of an egg. Can we tell our Surgeon to make it as small as possible or do they generally do what they want, afterall it is not like we can peek inside and see it for ourselves? Naturally I would like a 1 ounce pouch, but I know it may seem drastic but if I have any say so that would be my preference. Any feedback would be appreciated.

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