Grimaldo was different in that he had ability and played at a better level than those two have. More his attitude rubbed Lucho wrong way it seems.
Him leaving does not just mean every single B team player in any position the team is short in should be given a chance. Even Pep never did that with much more talented players than Palencia or Nilli.
Nothing you will say will tell me calling up B players deemed not good enough is better than playing Masch RB.
Palencia is similar to Puyol in that his heart has taken him further than his ability. Giving him an opportunity in a dead rubber, a friendly, or a squash would not have hurt us, whether he was "Good enough" or not. And it's not as if Palencia especially is playing poorly for the B team, he's just not playing against competition good enough to make you think it means anything. We're at the point where we desperately need a RB solution and we have no answers. When you lose your keys you don't check everywhere but the bathroom because "It can't be there". When you're trying to learn a new skill you don't scoff at someone's idea to help you because "It won't work", and when you don't have any options for a position you need filled at work you don't just leave that position vacant without trying to fill it because nobody is "Good enough".
Because the keys might be in the bathroom, the idea to help might actually help you learn the skill, and that person who isn't good enough might just end up being good enough. Granted, there's a solid chance they won't work out, but trying is better than rolling over and never getting to work, never learning a new skill, or never finding an option for RB.