CODE Sports reporter Peter Badel judged Sam Walker to be the leading contender for Australia's halfback role alongside Cameron Munster.
Munster appeared likely to wear the No. 6 jersey, but coach Kevin Walters still faced a choice between Walker and Tom Dearden after an unconvincing win over Fiji.
Badel said Dearden had made a less convincing case for selection.
Tonga also faced a difficult selection decision with star halfback Isaiya Katoa returning.
Samoa's prospects against Australia and New Zealand were another talking point, with a potential team weapon highlighted.
The selection questions and team assessments featured among the main discussions from the World Cup's second week.