@Michael Hawkins hey, good question and honestly a gap worth flagging in the docs — the concurrent connection limit as central isn't something I've seen explicitly called out either, and it really does depend on the underlying BLE controller rather than just the spec ceiling.
What I'd suggest in the meantime is reaching out directly through the Dev Hub or dropping a message to the team, because that's the kind of firmware/hardware-level detail that Moamen would know off the top of his head — the module's RF design is optimized for range but the simultaneous connection count is a controller resource question (connection event scheduling, memory buffers, etc.) that varies.
That said, for a 4-6 node mesh-ish topology, you might also want to think about whether you actually need true simultaneous central connections or whether a coordinator-style broadcast/scan pattern with the BLE modules would serve your use case better — at 2Mbps you've got headroom to poll peripherals fast enough that it can feel simultaneous for most sensor/telemetry workloads.
