I would be inclined to agree with you.
BSL fits well enough for the pullet.
It's the cockerel with five toes that's confusing. Since it's unlikely to be a random mix if it's from TSC.
Most BSL at least have a tinge of black.
Very interesting.
The pullet does look like a BSL...
If I took them as a pair I might have said BC Marans...but there are a few things that rule that out.
One being the interesting discovery of the five toes on the cockerel's foot.