The clues were all there, really. To be fair to Farage, he sensed it. However he either misjudged it, or thought he could ride the tiger.
It's quite illuminating how much the rank and file Reforms hate the Tories. There is a mathematical case to be made that Reforms decline is directly related to the number of ex Tories they gleefully hoovered up.
Too late now. They are stuck with them. And Tories gonna Tory.