That is a good topic. I was always worried Jonas is not communicating with the team. He is a mindful boy but not shy or quiet,but wasnt talking. It really started to come out from age of 10. So my thoughts about that are that it is different time for everything and everyone; you dont need to push it ( as yes, we are all different character, age, othet circumstances) but definitely to talk and discuss it with your keeper and Listen what they think about it, worries, fears. You need to educate them how important and valuable Keeper's voice is ( my favourite - The Power of Keeper's Voice), that keeper doesn't need to shout loud and much but Short , Clear, Positive and understood to team instructions ( maybe short preagreed terms, like "Keeper", "Clear" etc, depending on situation). For coach to talk to the team and explain to listen to keeper( as keepers themselves can struggle to explain this concept to the team ) A lot can benefit improving Communication. But ask and listen what keeper thinks and tells about it, they can tell you a lot that might help you to help them. And encourage them to talk to team, their voice, encouragement of the team and instructions are so important!