Marmoush and Cunha weren't as attractive in the summer, so the fact that they could have been purchased then is irrelevant.
It's precisely their form since the summer which is the reason clubs are now interested in them. Before that, no-one had even heard of Marmoush and Cunha had had only one good season under his name. The fact that he's now having the best season of his career is why clubs are interested in him.