First, don’t split your group unless both groups agree and are capable of making it down safely. There are far too many stories of chicken/sick/slow hikers being separated from their partners and having a bad outcome.
The permit doesn’t require your group to stay together. There should be no problem if group members climb different peaks, hike at different speeds, or go home on different days. I would give your group members a copy of the permit (hard copy or electronic) in case a ranger asks to see it.