It's really a case of the tank(s) using a macro or just typing in chat "tank orbs" or "swap" or "party orbs" so they know who's got them. There's a bit of finesse involved if they're learning but someone else could potentially call it out in chat easily.
Typically you have a BRD to bait on the outside, way mark set on the land edge behind ramuh. Black mage or 1,2,3,4 or 5 set near the way mark around the half behind Ramuh with the higher number closer to Ramuh's front. Black mage almost always 1, usually just sits on the waymark unless they don't have the aoe and just move out or stay there for an aoe heal or so.
Typically you have a BRD to bait on the outside, way mark set on the land edge behind ramuh. Black mage or 1,2,3,4 or 5 set near the way mark around the half behind Ramuh with the higher number closer to Ramuh's front. Black mage almost always 1, usually just sits on the waymark unless they don't have the aoe and just move out or stay there for an aoe heal or so.