BT in this case I’m sure means the Vultee BT13 or Vibrator on the other hand the it was said if you could fly the T6 you wouldn’t have any trouble with anything thereafter.
I was told that there are 2 sorts of L19 pilots those who have ground looped and those who are going to.
I agree with the comments on the Pawnee the easiest taildragger I have ever flown.