I didn’t disagree with what you said I only stated that it was probably easier to source a stud that as you put, competed at the highest level than most bitches you could get your hands on. And of course the majority of first cross litters have the greyhound as the dam no matter what the sire is.
There probably aren’t many scenarios in which it would be feasible to have the greyhound as the sire especially if pastoral/terrier or bull type bitches being the dam