Fred Wood (13)
See I just don't see that as a compelling argument. To'omua has never suffered for being small. If bigger was better we'd have Eto Nabuli on the wing and Reece Hodge at flyhalf.
To'omua has runs on the board, I don't think we can just flood the back line with rookies and expect it to work out. McDermott at 9, Petaia at 13 and Wright or Daugunu on the wing is more than enough inexperience for a Bledisloe cup team.
If I was Rennie I'd want to fight fire with fire. One thing to remember is that Irae Simone and Jack Goodhue were midfield partners back at the Mount Albert Grammar 1st XV. He's a born and bred Kiwi. Having watched Super Rugby AU I reckon Simone has been the most similar style-wise to the NZ midfielders from Super Rugby Aotearoa.
And I think you're overstating the inexperience thing, Simone isn't exactly a baby. He's already 25 and he's played his fourth season of Super Rugby.