The velocity through a single pass rad will be less than a more restrictive dual pass design of the same size.
Given a big enough pump, you would force the air down through the core, but why fight it if you don't have to.
There is no cooling advantage of feeding the warm water in at the top.
In fact, due to convection, feeding warmer water from the bottom could help a little in optimizing the flow through the system.
It may not be a lot, but every little bit helps.
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