Barcelona can still count on pena. Even though pena was not as experienced as stegen but he was good enough. The club shall give him chances, it's caused by you will never know how big his potential until he will be showing it to you. Pena can still become secondary goal keeper for barcelona.
Many people are doubting his performance but let's wait till barcelona will put him into the main squad, im thinking some main players feel a bit skeptical toward him since he was rarely playing for the club but he will develop himself with the goes of time.
You can't see his potential till pena will be a regular starting line up in the club.
Barcelona less make rotation with goal keeper position and last season Iñaki Peña have appearance one match in La Liga, with serious main goals keeper Marc-André ter Stegen have chance for Pena to be first choose but in last three matches he made 1 of clean sheet when facing Atletico Madrid.
Pena still not has experienced as goals keeper but Barcelona less option without have the same level of goal keeper between Pena and Stegen. it's actually too early to judge Pena performance with Barcelona in last three matches, I watched his crucial saves last match against Atletico Madrid and he looks goals keeper with keep quit.