Valencia started the season last year with Gabriel Paulista, Mouctar Diakhaby, Cenk Özkacar, and Cristhian Mosquera as their first-team center-backs. Of these, Paulista departed to Atlético in January, Diakhaby’s injury will see him be left out until April of 2025, and Cenk has joined Real Valladolid on loan.    Now, Valencia is stuck with 20-year-old…