I wonder how closely bred these birds are.
There have only been known surviving Cream Legbars imported into the US so the gene pool is certainly shallow especially if they are all from the same import group...
Greenfire fist imported 8 Cream Legbars (one rooster and four hens from one flock and a trio from another flock) they got Marek's, resulting in 1 rooster and 2 hens out of the group of 5 and 1 rooster from the group of 3 surviving...
Total 4 imported birds, 2 blood lines...
Greenfire bred the trio together to create the A line and any female offspring from the A line were bred to the unrelated rooster to create the B line...
Greenfire then imported another trio (1 rooster, 2 hens) and bred them to create the C line...
Total 7 imported birds, 3 blood lines...
Greenfire then imported 2 pairs of Rees birds...
Total 9 imported birds, 4 blood lines...
And that is where all US stock comes from, unless someone comes across proof that someone else smuggled some in...
I'm sure Greenfire has done the best they can to not inbreed, but they have little choice when it comes to line breeding... How planned out and how much diversity they have in their breeding schedule is anyone's guess...
Also worth noting is that when they imported the Rees line they stopped breeding the A, B and C lines... But, I have to wonder if they now have brought back some of that A, B, C blood for diversification since they now offer a 'production' line separate from their Rees line offering...
And that is just Greenfire and the original source, you can almost bet that many 'quick buck' hobby breeders and hatcheries don't even have much if any established breeding program, so if your birds come from some guy or some hatchery who knows how much inbreeding happened or if any attempt was even taken to avoid inbreeding...
Oh and I agree with Dom's guess at the two wishy-washy ones, but either way it might pay to band them and keep track to make sure the guess was right so you can get a better feel for your lines autosexing traits...