My opinion regarding this issue is that Gulfstream does’t want to end up in the same market condition of ,let’s say Airbus or Boeing , they want to control the number of pilot rated on G aircraft , basically no self founded pilot , so the only way to have a G type is working for a G operator , since the number of rated pilot is pretty low , is relatively easy to find a job on those a/c . Also if you note the majority of this type are N registered , so USA pilot garden . Worked for a private owner with some G5 ,and also the recurrent training or annual check was made in USA each year as part of
contract Gulfstream- owner .