Half the knockdowns were illegal trips or wrestles, ignoring the neutral corner rule, backhand punching (which Baer also did a lot of against Schmeling).
Schmeling picks apart Carnera's jab, and then counters over the top with rights. Just like it did with Louis, it builds up. One-sided fight where Schmeling wins wide on the cards or TKOs him.
This fight nearly happened a couple of times, but it would probably have been a bit before Carnera's prime. It was probably better for him that he had to wait, and got a slightly softer champion to challenge.
No it wouldn't. Riddick Bowe was a good fighter. Carnera hit hard and had a good jab, he was nowhere near the fighter Bowe was.