Hearing first hand from Bill will be a very good thing. however, we see error's that are either from him or statements made shortly after the hijacking. the right questions need to be asked.
The crew appeared to help Paul with the map he made. documents state that "the crew of the above airline has now spotted a possible area for the suspected departure of the hijacker to be over Merwin lake, near woodland, Washington"
Ask if he can recall how close to the Battleground VOR 305 was and did they fly VOR to VOR and can he recall how far off centerline from V23 was deviated..
They also made a statement of using the autopilot during most of the flight through Washington. most of the path is relatively straight flight.
Statements of the past need to be brought into the conversation along with asking if the flight path could be over the location the money was found in 1980 vs any maps made shortly after the fact showing different. also, whether they were aware of there position vs the ground and did Anderson plot anything for record.
Try to determine if the oscillation and pressure bump was immediate or minutes apart.
The time of the possible jump has been well established through the transcripts and his interview. the location or coords seems to be the error..
50 years is a long time and it could be rather easy to "guide" him into things. lots of things need to be put on the table for review moving forward in a positive direction..