Good summary
When all goes well, then there is no issue, though those on board might wet their knickers, but swear blind everything was kosher.
In the incident I mentioned earlier, suppose the handling, but non-current pilot had died in the crash. Suppose the family then decided to take action against the PIC or his estate.
In my instance, the PIC took the blame and insurance paid out. They both survived but the aircraft was lost. In the event of death or serious injury, all bets are off.
For what it is worth, our group rules say that when you are at group limits or when you feel you are at your own personal limits - whichever comes first - then have a check with an instructor.
If you or your group work differently then fine.