Makes sense now. How close you get back to barnevelder depends on how good the male is to start with.
Do marans in the USA have feathery legs. It's a dominant trait. Also certain leg colours are dominant and you may not be able to reproduce the yellow legs of the barnevelder. Have you got a picture of him.
Barnevelders cross ccl do produce olive eggers if the barnevelder is from good brown egg stock.
Momma Splash Marans is a breeder quality hen on egg scale of about 5 to 6 (from line of 7 egg color) and proper leg feathers for the French line. US has cleaned legged, however you can purchase French line with the leg feathers.
However, the Marans leg feathering does seem to drop pretty quickly from my experience and report from the breeder's experience.
I've got 4 chicks, about a week old, hatched from the Splash Marans-Barnevelder....all blue grey....not sure what final leg color may be yet...maybe grey, but may also go more yellow. Only 1 has leg feathers so it dropped off three chicks already. The Olive Eggers I've hatched from this line (Marans/Isbar) were clean legged....but again the Marans breeder stated the leg feathering drops off pretty quickly...and I would concur with my current experience....but of course that doesn't mean it couldn't crop back up later (those would be cullable).
As to leg color....now that will be a different matter....leg color as you know gets trickier (my yellow legged Cal Grey hens...barred rock/leghorn....and the yellow legged Barnevelder roo produced a black sex linked grey legged pullet....not sure how that worked...maybe you can tell me).
Here's my Barnevelder roo (Barney) below...from Ideal hatchery.
Thanks for your input. My goal is egg color first and foremost...I'm playing with feather colors...I'm color coding my hens so I know at a glance who is laying what egg color

and my egg basket
