Also the blood and brain matter found deep inside the barrel, old Bryan apparently didn't want to talk about this because he didn't have the necessary shadowing and appropriate music, so it remains a problem for Bryan how to explain such strong forensic proof against old daddy, particularly if Bryan wanted to switch back (why not - all the other hangbainers have tried it) to a close contact shot - because a close contact shot would have meant the spatter was shielded by the gunman, but Bryan knows there was no gunman there, and no appropriate music or shadow - so he just left it out and chased a photo-copier salesman instead. Bryan didn't want to talk about that spatter on Robin's shoes occluded as being from his own wound (that proved it Bryan, that it was daddy what done it - so you left that out as well.)
Also I can understand why Bryan left the strip search of David out because it showed that David was a suspect from the outset but more importantly that he didn't have any scratches on his chest. Well, I've got an idea for ya Bryan, how about a show called 'The Bain Murders - what I left out.' I'd watch that.