Yup... Joe was wrong (sorry Haddy!).
As long as there is a decent flow, the coolant should drag any air to the air trap, but do watch out for setups using something like a Swiftech: make sure you fill those pockets of trapped air.
(Many waterblocks suffer from this issue, but the Swiftech makes it more obvious. The Swiftech WB is a fine product)
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