I didn't read through Cyprus' post, sorry.
kinda wiped out, been busy today.
on the pink egg shell, it is a variation on brown, it has to do with the thickness of the bloom on the outside of the shell, which is genetic. it's possible that it could give daughters eggs a pink outer layer, if crossed with the BCM it could make a grey color shell it kind of depends on what you're starting with too.
there's no real guarantee though since hen egg shell color does have a larger influence than roo genetics on the offsprings egg shell color.
you are more likely to get more variety from the "blue shelled" roosters offsprings eggs, you should get some nice olive eggers from you BCM
With the "pink egg" roo you are more likely to get variations of brown shelled eggs from his offspring which would include lighter greens.
here is an egg shell color chart that I came up with I don't have the work done yet to show what would come up based on parentage, but it might help.
from your isbar and the pink roo, you would be likely to see o o white, o o tint 1, O o blue, O o green 1,
from the BCM (not sure what number your hen is showing on the darkness chart, but oo tint 6 is meant to correspond with the BCM chart #4 color. and the color would likely be between o o tint 4 to o o tint 6
with the blue roo, your isbar's offspring would be more likely to lay OO blue, OO green, Oo blue, Oo green
your BCM off spring again assuming BCM chart #4 could be Oo green3 to Oo green 5
(I'm sure this isn't perfect, infact I think I have missed the possibility of white or brown in there.... But as I said I'm pretty tired.)

on the pink egg shell, it is a variation on brown, it has to do with the thickness of the bloom on the outside of the shell, which is genetic. it's possible that it could give daughters eggs a pink outer layer, if crossed with the BCM it could make a grey color shell it kind of depends on what you're starting with too.
there's no real guarantee though since hen egg shell color does have a larger influence than roo genetics on the offsprings egg shell color.
you are more likely to get more variety from the "blue shelled" roosters offsprings eggs, you should get some nice olive eggers from you BCM
With the "pink egg" roo you are more likely to get variations of brown shelled eggs from his offspring which would include lighter greens.
here is an egg shell color chart that I came up with I don't have the work done yet to show what would come up based on parentage, but it might help.
from your isbar and the pink roo, you would be likely to see o o white, o o tint 1, O o blue, O o green 1,
from the BCM (not sure what number your hen is showing on the darkness chart, but oo tint 6 is meant to correspond with the BCM chart #4 color. and the color would likely be between o o tint 4 to o o tint 6
with the blue roo, your isbar's offspring would be more likely to lay OO blue, OO green, Oo blue, Oo green
your BCM off spring again assuming BCM chart #4 could be Oo green3 to Oo green 5
(I'm sure this isn't perfect, infact I think I have missed the possibility of white or brown in there.... But as I said I'm pretty tired.)