It points out to me the importance of an "entering and rolling" call.
But we don't know if this call was made or not, given that recordings from Caloundra won't "hear" any ground traffic at Caboolture. Given Dave's professionalism (that I'd seen), I suspect it was.
Commencing the turn, a pilot creates a blind spot in the opposite direction and excludes themselves from the see-be seen,
True, but by this stage he'd obviously seen the Pawnee and was trying to avoid it. Nobody, just nobody, would otherwise attempt a turn before the runway intersection (it's a run of 800m)..