Last weekend I took a couple friends to the local crag for their first time out.
Since I was the only one able to clean, others led and set the anchor, but on occasion if the leader were unable to reach the anchors, I would set the anchor and belayed the others up from the top using a grigri. That worked pretty well, though I'm aware that Petzl doesn't recommend using the grigri in such a manner (a redirected belay is preferred.)
I did notice that the DMM Pivot set up in guide/auto-blocking mode had a dedicated method for lowering — using a second biner to adjust the angle of the device. Are there concerns with doing so for lowering a second climber all the way to the ground?
Whenever lowering is mentioned, it's always in the context is lowering the second "a few feet" or so.