Despite once being a driving force behind the airport project, I don't think Tinkler has been involved in a while so not surprised he didn't really have any think new to add.
Stobart can't really change their story now without being seen to be liars or incompetent (or both). Remember:
Ms Willard said: "As soon as it became clear we couldn't get the roster in place, we announced it. Everything else was ready. It is frustrating to be thwarted by a skills shortage."