I think it's going to be a little hard to guess given recessives that could be hiding on both sides being both are from a mixed color flock. I'm still not entirely sure what Biscuit is himself but I think probably silver/gold eb/eb (partridge) and probably at least heterozygous for Columbian or a Columbian like restrictor. I'm not sure if he has any blue involved or not, his tail looks pretty dark but it's hard to rule out dark blue just by looking at it.
I'm not exactly sure what e-allele splash silkies tend to be on but by down pattern I've seen in my blacks and blacks from paint I expect maybe they are more often based on ER (birchen) so I expect that blue and splash are based on the same. That e-allele isn't going to be very affected by Columbian and it is more dominant than eb (partridge). Being splash we know that they are homozygous for the blue gene and will always pass it onto offspring.
So my best guess is you'll get some blues (likely with leakage) and possibly some splash if Biscuit happens to be blue as well. You may possibly get some blue partridge like birds, grays that are blue as well (silver partridge) and even some splash based grays and partridge like birds if Biscuit is carrying blue. The ones that are grays/partridge like will be more affected if they get the columbian or columbian like restrictor from Biscuit so that will make the pheomelanin areas more extended and push back eumelanin to only certain areas similar to what you see on Biscuit. And of course recessive white being another common recessive floating around in mixed color flocks some recessive white chicks might be a slight possibility. There is a lot of potential for multiple colors but only the blue babies are something I think you will get for sure. That red leakage is likely to shine through especially on boys as well.
That's just my best guess anyway, I may not know what I am talking about and be completely off.
Oh and based on the down in the picture at least one of those babies looks like it might be more of a splash partridge like bird.....maybe the boy you have with less spots and the red on the wings?