I have to guess that Journalist from Marca assumes we are shelling out the 32 million for him to be a starter because he thinks Valverde wasn't impressed with Umtiti,Marlon and Verm and not really based on fact.
How I think Valverde sees things.
Marlon-good chance he thinks he's not ready yet to be the fourth CB and could send him out on loan for a season
Verm-To injury prone to be fully relied on to be the 4th CB, which has been a theme since he was here and he might leave this summer.
I wouldn't be surprised if Valverde wants to avoid a situation if Umtiti and Mascherano/Pique were suddenly injured out of nowhere and he wants to avoid playing a raw CB like Marlon in bigger games. Still a lot of money for a CB like Martinez though.