Miracle workers then and now are a dime a dozen. For example, here's the pagan version of Jesus who was a little younger than him: https://en.wikipedia.org/wiki/Apollonius_of_Tyana. He's similar enough to Jesus that various pagans had written polemics on how he had cooler miracles than Jesus.

Every historical epoch will have their version of Joseph Smith or L Ron Hubbard. It just seems ahistorical that for this particular case of a miracle worker, people just made him up instead of doing the usual thing of attributing miracles to themselves. We all laugh about Joseph Smith sticking his head in a fucking hat to read a bunch of text. Imagine if Joseph Smith made up a guy who stuck his head in the fucking hat instead. Why would anyone bother listening to Joseph Smith instead of trying to chase after the imaginary dude?