I agree with the above. The real reason aircraft are returned in poor condition is that the host airline is poor and in trouble financially, and there is then no way to return surplus aircraft. The only option is to park the plane, no flights, no maintenance, and hope to keep the airline going. OK, it's the back side of leasing, not owning, but in RW there would be negotiation.
As a regular leasor/ee (never knew which was the actual owner) there are obvious reasons to arrange the lease to expire before the next C check. That just adds to the cost of leasing your aircraft out but why would I do it differently?