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That would depend mostly on what the buck is carrying. He's a broken, so you could get brokens and solids. Chocolate is recessive, so whether you could get chocolates (or the dilute, lilacs) would depend on whether he's carrying a chocolate gene. Otherwise, I would expect black-based colors. Tri is
supposed to be an agouti color, but I have seen self tri's that had smutty tortoishell markings bleeding through, I don't know which he is.
If he's an agouti-based tri, then you could get chestnuts (probably not true castors, but maybe
). They will have gotten a dilution gene from their mother, if he has one, then you could get blue (or the agouti version, opal).
Tri's are broken harlequins. Harlequin is dominant to the non-extension gene, which gives you tortoishell and its agouti equivalent, orange. I don't know if either buck was a homozygous harlequin, or whether either (or both) may be carrying the non-extension gene. Both bucks are expressing the harlequin gene, if both are also carrying the non-extension gene (and one or both does inherited the non-extension gene from their father) you could get torts or oranges. With their father a tri, if bred to a tri, you stand an excellent chance of getting tri's and harlies.
If there are REW's, Himi's, or any kind of Chin or shaded behind the parents, those things would have to be factored in as well. This is one of the reasons that pedigrees can be so useful.
There now! Aren't you sorry you asked!!
(Oh, and BTW, that greyish undercolor is perfectly normal. I haven't ever seen a chocolate that was solidly the same shade of brown all the way to the skin!)