Thinking out aloud here but, picking a back row is tough, could go with any number of combinations (in no particular order):
6. Higgers, Jones, MaMahon, Fainga'a, Reid
7. McMahon, Fuglistaller, Fainga'a, Reid
8. Higgers, Timani, Jones(?)
I reckon any of these could work...
6. McMahon 7...