Personally, I am quite sympathetic to the dissenting view of my paleontologist colleague Simon Conway Morris.
Such explosions and revolutions dominate the history of life, which was rather a series of abrupt saltations than the gradual change predicted by Darwinism.
The abruptness seen in the Cambrian explosion can also be seen on smaller scales throughout the fossil record.
How much confidence should we really place in dubious fossil evidence when it is boldly claimed to prove Darwinian evolution as a fact?
He had rather secretly always been a devout Protestant Christian and he too had some doubts about the causal adequacy and sufficiency of neo-Darwinism.