According to the Prelim, the Jab pilot broadcast to Lismore traffic he was 4 east of Lismore, 5300ft and descending. The Jet didn't hear it and there is no evidence the CA/GRO did either. In any case, the CA/GRO is employed to provide traffic at BNA, so traffic broadcasting to Lismore, which he probably hears all day, is irrelevant, especially if it sounds like he's inbound to Lismore.
As an aside, in the old quadrantal days, those two aircraft on those tracks (in cruise) would have crossed with a minimum of 500' separation and no one would have batted an eye.
Last edited by Traffic_Is_Er_Was; 19th Apr 2021 at 22:51.