No one is suggesting circumvention of currency. Nor are we talking about
asking just *anyone* to be a crew member.

We are talking about two licensed pilots, both quaified and legal to fly an
aircraft with dual controls and setting in the front seat. Both with current
medical certificates and let me add BFRs for the point of discussion. That
is a far cry from being a stereo typical passenger.

If either pilot is qualified to get in the plane fly solo, what in the regs
says they both can't pilot the plane, as long as they log only the time and
landings made while their own hands operate the controls.

And if we absolutely insist this person must have a title, what is wrong
with a back-up pilot?

What would be the difference in the above if you replaced "two
licensed pilots" with "two student pilots"?

It would appear to me that the same would apply.

(BTW. IMO it is not legal for two pilots out of 90 day currency to fly
together. )

Brian