OMG I can totally relate to this
like when our school football coach says we need to work together as a team but then we have one player who just doesn't get it
he's always complaining about the referee or something but his teammates are all, "dude chill"
anyway Pulis is saying that even if the unhappy player isn't doing well they should still try to support them because you never know when they might turn things around
and also having strong characters like captains and kit guys is super important
it's not just about the players on the field, it's about everyone working together towards a common goal 