The leaseback thing is what the insurance underwriter explained. Our "rough" (again, we've only talked back and forth about it) agreement is:
10% Buy In
50% Hangar (unless it's moved to NC, then it's 10%)
50% Upgrades (unless we can't agree on the upgrade, then it's up to him 100% - i.e. ADS-B, I want a new transponder, he wants the wingtip light)
50% Flight Hour based maintenance (we're going to define this more, but 100 hour, etc)
10% Calendar based maintenance
10% Insurance (insurance would be lower if I was the primary - I have 2,000 hours and a CSEL, he has 175 and a PPL)
Unscheduled maintenance will be % of our flight time - if I fly 75% of it in a year, and he flies 25% then I'd be responsible for 75%
The "out" clause includes reimbursement of the 50% paid towards upgrades based on when installed (i.e. within 3 years, if he decides not to sell and we've agree upon the ADS-B transponder that I paid half for, I get that back) and the 10% Buy in payment.
Right of first refusal for sale
My wife and I are prepared to eat any loss and walk away if the deal goes sour, but knowing where he stands financially (he overextends himself with toys) and also knowing that he is facing no job in 2 1/2 years, makes it seem like a good idea to get in now, if for no other reason than the right of first refusal clause. His original plan was to not take the continuation, go to an aviation college full time that will pay for his certificates and "prep" him for the airlines, then work as a CFI until he can get on with a regional. He said that's still his plan, but that his plan will be executed later rather than sooner. Because he was passed over twice, he's not eligible for promotion and Title X says he'll be out of a job. None of what he has planned is really conducive to owning your own plane, hence why I'm pretty certain he's going to be selling.
His plans all changed when the meltdown in the airlines started happening. Had coronavirus not happened, I probably would own the plane outright right now.