All of them are players that have gotten chances since Pep though (and they are now first team players). Basically no other player after them has gotten a chance. Dongou, Patric and Adama made their debuts and played another match in a week (CL against Ajax for that matter), but we haven't seen them since.
We have four central defenders, yet when we have two injuries (like today); we rather have Song and Adriano as their alternatives instead of calling up Sergi Gómez, Edgar Ié, Bagnack or whatever is available. In the Copa we didn't call up a single B-team player besides Dongou just this one time.
Also Denis Suárez is supposed to earn a promotion starting next season, but he is yet to make an appearance in the first team.