Quote: Perhaps...but if he had silver-looking birds, then did he just randomly outcross some to see if they had cream? What I am saying is that there must have been some visual difference. here is a quote from Punnett:
“It may be described as a Brown
Leghorn on a cream basis, to which has
been added the barring factor causing
it to be autosexing. It is also crested
and lays a blue egg”
R.C. Punnett 1957
If your theory were to be correct, then he would have said on a silver basis - perhaps saying "a silver ground, that hides recessive cream, which can only be found by outcrossing to prove that it isn't pure silver".
And this may be one place where the theories split apart. Presently, the UK is saying that the very light rooster that you pictured and said was genetically correct is the standard. What I am trying to communicate is that if the totally silver-looking bird is genetically correct, then how did Punnett ever see Cream in the first place. Cream was supposedly a color that had not been seen in the UK. Silver not so much. That is the reason that people are saying I want to breed to the Punnett bird, not to the UK standard (if indeed the UK standard puts cream indistinguishable visible from silver) With crest and blue dominant genes, why would anyone bother with cream if they wanted a silver bird? They could just add crest and blue to silver Legbar.