Yes, initially the planes are to be shared between the Oakland and Livermore facilities. For logistical reasons, the transition will take a few months. As those who are currently training in the Duchess get finished, the Duchess will slowly become phased out. The Seminole will become the multi trainer at Sierra.
The 5 Seminoles Sierra has at this time are being shared and are from Pan Am. They are not solely for the Korean program. As far as the rumor about some of them going back to Pan Am . . . I suppose that could be true, but it doesn't really matter because Sierra will be acquiring enough of them to keep the Seminole as the trainer. Some could be sent back to Pan Am, get more from somewhere else - what's the difference, I guess.