As it stands, Zwift is limited to displaying (and thus also listing), only 100 riders; which means for group rides > 100 riders, you cannot tell if anyone is being dropped etc.
Ghost riders makes this even worse (where a rider mid-pack might randomly appear behind you temporarily for a few seconds). Not sure when the ghost riders became a thing, but it has been a very prominent bug this year.
At least in the rides I’m beacons on, it’s the Red’s duty to keep Yellow informed of what’s going on, and times etc. More or less due to this issue of not really being able to tell as yellow at times.
After folks have been requesting the visibility of more than 100 riders for… long before I’ve been here, and seeing how it hasn’t even been addressed, I don’t see it happening any time soon, as it appears to be something fundamentally core to Zwift and its function; as it’s true even on Companion.
That said, there are potential alternative solutions using features already in place: