No problem Kevin. The reason to have the flywheel on the input side is that it stores a lot more energy when moving fast. Once you’ve slowed it down to the speed of chunking, it has a lot less stored energy.
You are correct that the gearbox has to be able to transmit the full power of the flywheel. That’s one of the main reasons I used a baler gearbox, it’s designed to take this sort of constant pounding when used in a baler. A lesser gearbox might break under the shock load.