Okay, now, on the Ed Crenshaw breeding up top, I have never heard that about Boomer. What I do know is Ed Crenshaw had some white dogs, and many heavy Boomer dogs are known to be white, so there is some circumstantial evidence to support this theory.

On the Tombstone dog, I am one more you can add to the list of people who believe he was brother/sister bred off of Toot & Ch Baby
Speedy Allen's Gina makes no sense, both as a breeding as well as why top dogmen would have it, use it, etc.
By contrast, a bother/sister breeding of Spike/Black Widow dogs explains why Tombstone was so game, and it also explains why he was such a prepotent producer.

And now I am going to throw in another fake breeding that "I heard of" (and believe) and that is the true breeding on Honeybunch. I am one of the many people who believes Honeybunch was NOT really off of Bullyson. To the best of my knowledge, all Bullyson ever threw were Black dogs. He was a black dominant AA dog and it was genetically impossible for him to throw anything else, no matter what he was bred to. (Sons/daughters of Bully could, if he was bred to red/buckskin dogs, but anything off of Bully directly had to be black.) That said, my belief is that Honeybunch was a father/daughter breeding of Carver's Amber bred back to her father Cracker (making her 3/4 Dibo/Black Widow, 1/4 Rascal/Black Widow, and Rascal is Dibo's 1/2-brother). I forget where I heard this, but this breeding did happen, and it also makes more "genetic sense" than Bullyson to Amber. It also explains why Honeybunch was such a great producer.

That's my $0.02.

Jack