RE: Getting that last trait!
There's not a great answer, which I think is why nobody answered the question for so long.
Moonstream, you are quite right that if those cats aren't hiding anything other than silver, then sophiejayne is going to have to reboot the line with a different cat that's got a full 9T (showing and hiding), and that doing so puts the other traits at risk.
When I first read the question it put me in mind of my own line of 8T snowshoe creams who HAD white whiskers hiding on both cats, but would not throw the white (even though, statistically, the double-recessive throw should occur 1 out of every 4 breedings). Sometimes luck is not with you. Sometimes lines fail. Sometimes the recessive is never thrown. Sometimes it is only thrown on all boys or all girls, or with a gender that you can't backbreed with a parent for some reason.
The only thing to do in such a case is to take your best kitten and start over on the line with a new partner, do sibling breeds of the best of those kittens and hope to see the whisker in the grandkids.
The Pawsable Traits Reference manager and a Chart keeper.
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