I don't know, Wakie. He knew Bush was the son of then Congressman G.H.W. Bush, so he would have stuck out more than any other. And before he died, Bush had returned to Texas and was an active public figure for his company. Killian could have easily made comments regarding Bush due to his presence.
It is possible, but I would say still highly unlikely. Congressmen are really a dime a dozen (especially in Texas which has 20+ of them). Also weren't the sons of John Connelly and Lloyd Bentsen also in this unit? And Arbusto wasn't exactly a high profile company.
Ah well, he very well may have made these comments. I just find it kinda random.
At any rate, I really don't care if Bush is a bad pilot or if he was derelict in his duty. I'm more concerned with his performance as President (which I perceive to be extremely poor).