What are your goals?
Are you just keeping a couple for pretty birds and eggs, or would you like to get them evaluated according to the Marans Standard of Perfection (SOP) and egg color?
My suggestion would be at minimum wait to see what color they lay before deciding to sell/give away and keep...
How many eggs have you gotten from each girl? I can't vouch for all lines but generally with my Marans they will darken by the second week. With Marans it's recommended to track their first 20 eggs and this will give us their average egg color they will lay.
Here's a decent example of one of...
Ok, if you can.. try to get a good rear and side view of his back end, that would be helpful. I looked back at the last pic you showed of him, couldn't see much of rear, but I thought I saw tail feathers on him.
I did a little research as I haven't encountered this mutation. If Oscar is in fact rumpless it's not recommended to breed this forward. True rumpless, tho is lacking the tail bone and no tail feathers so we need to see pics to confirm. If he in fact has tail feathers this is just a matter of...
Getting close...4 of the BCM boys are 19 weeks ish and the rest are all younger. I'd have to check ages on the Silver boys, they might be close to that 19 # also.