Their were reports Lucho, wanted to test Gumbau and thought he was "Physically" ahead of Samper at one point. once the season wore on Gumbau's minutes diminished and Samper got more chances. Camara was a weird one tbh. I never expected him to be used as an LB.
I think Lucho, when it Comes to Barcelona B/Masia Defenders he's really hard to please in that area or certainly doesn't rate them. you always seem him call up guys like Kaptoum,Samper,Gumbau,Camara,Jose Suarez,Mújica,Alena,Paik etc to train with the main team or even get to play in the Copa matches last couple of seasons but rarely called up any Defenders to train with the main team.
This Preseason He brought guys like Martinez,Marlon,Lopez,Nili (Defender wise) to Preseason. The one who stood out the most and got a lot of attention from the Catalan Media and Impressed the First team staff and Lucho the Most happened to be Marlon the guy who literally came straight From Brazil on loan!
Lucho gave a chance to Edgar Ie, and even called up Diagne for the same match but those two left(Edgar)/went on loan(Diagne) after the season ended. in some ways I'm not totally surprised about Marlon. Considering he was considered a top CB prospect in Brazil. With him impressing Lucho and the Technical staff he paved a way for him so far to stay on a Permanent basis.