His account makes no sense chronologically.
Absolutely, another problem the WC wouldn't deal with. But I don't see how faking a delay would help them if they actually arrived "on time" at the Paine address. To me a delay only works if somebody needed those 40 minutes to catch up or the flow of info out of Irving needed to be delayed...
The only thing I can think of in terms of "information flow" from Irving was Linnie May's story about seeing Oswald with a package of some description. I suspect that information was transferred to Irving about the rifle, lunch and bag. These had just been removed from the TSBD. I suspect the version of LMR's encounter with Adamcek is not what really happened (or when). Frazier's account of his actions after the shooting don’t make sense. I have always suspected the "curtain rod" story to have been concocted that afternoon to take the heat of Buell. I do not believe Linnie May saw any package that morning.