Pollination has no effect on bloom. It affects fruit and seeds. Calycanthus are not grown for their fruit so there is no pollination issue.

Isn’t most fruit food for something? I’m thinkingbof wildlife.

Very possibly. But you asked about the effects on flowering of cross pollination and there's no connection. They will flower just the same whether pollinated or not.

I said they're not grown for their fruit, not that the fruit is of no use to wildlife. Perhaps something does eat it, although it is toxic to humans and livestock.