I had always heard that Burr fired deliberately at Hamilton--this version seems to want to minimize Burr's guilt. I'm not surprised that Ellis would be part of it. He is a Jefferson scholar who rejected the story that Jefferson was the father of Sally Hemings' children, but reversed himself in 1998 when Democrat scholars thought trashing Jefferson would help Clinton survive the Lewinsky scandal. (There was new DNA evidence that came out about that time, but it was inconclusive.)
Where is the argument about where Burr fired? No one has ever said the shot was a ricochet, so ipso facto he must have shot at least in the direction of Hamilton since he killed him.