Are you just trying to sort the chicks? Sorry i don't have a tip for sorting eggs laided, I was planning to seperate one of my hens either later this year or early next to hatch a few of hers presorted.
As for the chicks I'm assuming your bbs hen and roo are either blue or splash? I don't know what a splash chick would look like but you would know a blue chick if you had one, those all look black. If both hen and roo are splash you would get 100% splash from her eggs, if either one is splash and the other blue you would get 50/50 for blue and splash, but you won't know her blue chicks from the other hens possible blue chicks. I'm guessing the roo is not splash as so far it looks like he has only passed on black to the chicks
Personally I have 5 EE, 1 with partial blue showing, 1 known hidden blue and a 3rd possibly hidden blue (both hidden are white). And 4 and 5 no known blue.. I can't tell the hens eggs apart either expect 1 whos is darker more olive. Only reason i know for sure the 1 hen is hidden blue was I collected her egg while she was in injury confinement so her egg was marked and placed seperate.
Hope you start hatching done blues and splash soon