Wunwing,
As one who worked with him in AIPA and tried to work with him when he became CP, suffice it to say that your glowing endorsement of Manning is not universally shared. Some might suggest that integrity is not his strong point and others might suggest that he is not entirely independent of the Chairman of Pelair who may have even lobbied for his appointment.
Given that the rumour is that ATSB Commissioner is second prize for keeping him away from CASA, you have to wonder about Truss' judgement in supporting McComic for DG ICAO and Manning for the ATSB