you still have a chance for partenogenesis and gynogenesis, so I still disagree. yes this is rare but happens and more so in reptiles.
a friend of mine who's also a ball python breeder had a clutch last year. the female was a normal. he raise her up to breeding size, her first year breeding, she was breed to a killerbee. had a clutch with hatchlings turning out as for the breeding. next year he breed it to a super emperor pin, again he got what he was breeding for. last year he breed it to a super pastel champagne and got all normal females. the clutch size was 4 or 5 I'll have to ask him again on that part. he doesn't have any males that are recessive and he keeps very good records on his snakes. being the male didn't past on any of his genes and they all got them for the female. which is one reason they all was females too.
I email tracy barker from vpi and she also stated that the only way to be totally sure that a hatchling is recessive is if the female in the breeding is the visual. yes many breeders sells 100% hets from breeding a visual male. and most likely they are.
I also know another breeder who's female have a clutch of eggs, the next year he breed her to another male and she again had a clutch. and the sire of this clutch was the first male, she retained sperm even after having a clutch between the 2 breedings.