So they think there is one specific animal path from bats to humans? It's already been shown that several types of animals can become infected, so why not mult

So they think there is one specific animal path from bats to humans? It's already been shown that several types of animals can become infected, so why not multiple paths? I don't understand why they think it necessarily started in the Wuhan area either; that's where it first started spreading rapidly and was noticed, but as we've seen in the US sometimes it spreads fast and sometimes it doesn't and even with testing there appear to be a lot of excess deaths where no one realized the cause was COVID-19. Could have been around long before Dec 2019 and then flared up in Wuhan. I'm not an expert though, maybe they have other clues such as from gene sequencing.