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When you cross a non-barred roo to a barred (cuckoo) hen you will get barred cockerels and non-barred (solid) pullets. They should be solid at hatch, and the boys will likely have a dot on the back of the head, from what I understand.
It sounds like yours would work just fine for making sex links. It seems like some of the weirder colors are coming from EE's crossed to dark-egg roos. I guess the EE genetics are already so variable, that you get a bigger range of results in the next generation. I'm just speculating here...
As for your white/ light brown crosses, they will give you more typical EE eggs. A white to blue cross gives you at least some blue layers, and a blue to light brown cross will give you at least some lighter green eggs. Every shade in between mint and dark olive seems possible. Even my 6 brown layers all lay a different shade, so their offspring would probably lay all sorts of shades, even with the same roo.