I don't have a great answer to those questions. I thought about that too. And I believe that there is enough cooling there, and I doubt that it will be felt through the passenger seat.
It is pretty roomy there and it is not air tight or anything.
Unless I make the effort to remove the seat after riding and check it, I will just have to wait and see.
The OEM amp is right there also. Honda thought it was okay. That should be a good sign.
Anyway, good questions. You guys just keep me thinking ...