PADI Drysuit Diver Manual, PADI International 2003,
“…you will learn that it may be more efficient to control your buoyancywhile underwaterusing your suit. (pg 30).
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Paragraph in the “Diving a Drysuit Section) “…At this point (excepting an emergency or problem) you will stop using your BCD until you return to the surface. Underwater, you typically control your buoyancy using your drysuit” (pg38).
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PADI Training video also states clearly the use of the Drysuit as your buoyancy control device while underwater and your BCD for surface floatation.
NAUI SCUBA Diver Manual, NAUI Worldwide, 2004
When you dive with a Drysuit, you use the drysuit for buoyancy control and the BCD for surface floatation” (pg 40)
These are only a few citations from two major certifying agencies concerning the topic.
All citations continue to state that you should always wear a BCD and use it for surface floatation and in the event you need extra buoyancy or in case of emergency.