Can you burst their bubble?
Information Silos come in all shapes and sizes, when a department or member of the team don't have the opportunity or resources to share information, resulting in duplication of work or errors occurring. When you are a key member of staff, the time out taken to deal with failures of knowledge sharing can become a vicious cycle.
When information is shared through specific people, there is a danger that someone in the chain can be an information bottleneck if they don't have a strong grip on their organisation, too busy with other tasks or overwhelmed by the amount of information or the number of people they need to update to keep the flow of information running smoothly.
Sometime ego can get in the way of a team functioning properly, and when information is power, people can take the 'need to know' mentality a bit too far. Consequently, individuals make themselves more valuable because they become essential to the flow of information. This stops the rest of the team being able to get on with the tasks at hand without the information overlord involved.
Occasionally there are key members of a team who should take greater control of sharing information, but suffer from an allergy to responsibility. When important answers are covered with blame and excuses, the rest of the team can only function as well as its weakest link.
Things might have appeared simpler back in their day, but when you've got a team member who insists on maintaining their old ways of doing things, they can create a massive hinderance to the rest of the team.
It's great when staff follow procedures properly, but when you have a member of the team who is so focused on their interpretation of certain rules and guidelines, such as new GDPR measure, it stops everyone else being able to get on with their work without the fear of a solid discipling. Overly officious colleagues can be a total log-jam to team productivity and sharing important information.