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There is a link here ---> https://www.backyardchickens.com/t/261208/sex-linked-information that shows what breeds can be crossed with other breeds to create a sexlink and I did not see Marans on the list for Rooster part. So it is not likely a sex link, however you can post pics of it as a day...

some broodies will sit until they die, so it may be best to break them and start again after they have had a rest and look healthy again. to break a broody get a wire bottom crate (like the ones you use for dogs) add food and water and put the broody in there. it may take a few days to a week...