Andrew Lownie has been all over the BBC in the last couple of days. He obviously knows a lot about the Yorks but occasionally he has strayed into speculation about other royals that doesn't seem as well sourced. I hope the spotlight doesn't go to his head and lead him into murky waters because he has done a good job exposing the Yorks.
As to William, we won't know what he will do until he is King. I do wonder about how much his illness is affecting Charles and what sort of King he would have been in better health. We will never know.