what evidence do you have there are witnesses who saw Bush?
There's only Campenini who served in Pittsburgh, so he wouldn't know. Bush would have been a celebrity with his connections, and also he is well known for talking to people and being very sociable.
At his fraternity apparently he knew the name of everyone there, and they elected him head of it. If he had done drills he would have got to know someone. In fact they've only begun to ask the right question. They should be asking for people who were at those drills and who didn't see him. They've been offering rewards for anyone who did see him and no one claimed them.
So if he blew off the Alabama training too then where in this web of lies was he really?