Sam, when you did the planning, I take it the name of the "passenger" will have been recorded, even though not a legal requirement it is useful in the event of an incident and the correct Next of Kin forms pulled. Do you have that information? As I mentioned earlier, a table showing each leg, A>B, B>C, C>D etc and the name(s) of the persons on board would clearly show how many of the flights had Ewald in the Stearman. TCT claims that on many occasions members of the team flew with her, the list would show just how many times this happened and if they were "guests" invited to share the experience or a 20,000hr+ CPL "comfort blanket".
When he was not in the Stearman, did he fly in the chase plane?