In router mode with wired eeros, you want to have the satellite eeros plugged into the main eero (perhaps via a switch) for backhaul to work properly.  Can I dispense with this topology for bridge mode and simply plug all of the eeros into the main non-eero router?

Related question:  Are the eeros communicating amongst themselves in wired bridge mode, perhaps to optimize handoffs/steering or perhaps to manage DFS channels someday?  Or are the eeros acting like totally unrelated access points?