I mean Roberto has a lot of "Experience" compared to someone like Palencia and Nili but I think even a blind man can see Roberto is struggling no matter who we play against these days in the RB spot. It's the same with Adriano vs Grimaldo. Adriano obviously the more experienced player but he wasn't anywhere near the player he once was by 2015, He was either injured or he just didn't look good at all even against small teams.
My point is yeah having experience is nice but if the player either passed it and has become a liability no matter how weak the opposition is or someone that just flat out isn't good enough to be effective in a position it becomes redundant regardless of how much experience the player has.
Nothing wrong with giving Palenica a chance. We seen enough of Bob to realize he just doesn't have the skill set to be effective Barcelona RB, with Vidal out why not give give the Kids a chance to see if they can bring more to the table than Roberto?