Have you seen the market? Potentially having a gem going through Barca B to Barcelona and becoming a Busquets level player (or even close to his quality) is huge. But if Barca B players don't get chances, we have another Thiago waiting to happen, since youth players will start to doubt their future and look elsewere. People were in awe of Asensio, but this is the sort of quality we could get through Barca B, if we don't neglect it.
This is actually Valverde's last box he needs to check to be a very good Barca manager. I'm waiting to see a youth player from Barcelona introduced by him in the first team with great success. Even Lucho had Sergi Roberto, a Barca young player that was rarely used before his time. And let's not even talk about Pep (Busi, Pedro), or Rijkhaard (Iniesta, Messi).
If he gives chances to Alena and he makes it big, becoming a talent close to Iniesta, it could be a game changer. If he doesn't, then he's clearly not that interested in trusting youth talent from La Masia. And I don't care what he wins, that will be a big minus for him.
I have to tell you, not seeing Barca B talents have a go in CL, in a meaningless game for the club, but a huge game for them as young players, was a huge letdown. Was not expecting Valverde to disregard them to play some bench warmers who are never going to be anything big at the club. Was a bit of a slap in the face for Alena and Co.