Right now it definitely looks like a small decentralized group who are so sure of their positions there is little need to report on recent activities.
You mean centralised, right? Because this is what Hive really is. A few witnesses control everything. This is not decentralisation, but the exact opposite. Centralisation.
If there would be no "small group" (nor any group), then it would be a real decentralisation.
If there is a group, then there is centralisation. Around that group.