Yep, Bushell travels with the team, knows the car and so already fits in.
Unless they have another ultra experienced driver with pedigree on hand to keep them pushing near the front ... could Rory convince Gordon Shedden to have a one off drive in a car he knows?
, (I doubt Jackson who was visiting AMD recently has any budget at all)
Overall, I would be surprised to see any other name in the car when they have a ready made pilot sitting in the garage