Ideally, rather than moving players to cover the deficiencies of others, which in turn creates other issues, such as off the turnovers, you play players with the skillsets that don't require us to plug holes. Particularly when those other players are highly skilled an in form also. Ramm or Wright as genuine back 3 options means JOC (James O'Connor) doesn't need to drop and doesn't therefore compromise the WB ability to attack off turnovers.
There are definitely more ways to kill a cat, the others are just messier and more complicated.
It’s not about moving players unnecessarily though, nor about hiding deficiencies, nor plugging holes. Plenty of modern teams play their 10 at the back. The 10 & 15 play at the back in defence and the wingers play up on the edge. It puts your best kickers in the back field. Lolesio played there for the Brumbies & Harrison for the Tahs. Guys like Barrett (even when playing 10) and Mo’unga play from the back too.
It’s been pretty standard for at least 10 years.
Cheika tried to take it to another level with players moving all over the place and that failed because the wingers were running from one side to the other and became easy pickings for the attack as they understandably fatigued. The guys inside fell down because they had to cover extra space and there was a lack of clarity around positioning. Cheika & Grey overcomplicated it and it fell apart.
But the standard use of the 10 at the back and the wingers on the edge is not at all complex and is deployed successfully across provincial & international rugby. Regardless of who the wingers & fly half are I would be far more surprised if our 10 didn’t play at the back in defence.
Edit: what I would love to know is why Daugunu never kicked for the Reds. It’s been commonly stated on here he can kick, and is in fact a good kicker but he never/virtually never kicked on his returns for the Reds. Does this mean he struggled to execute or did they just give him licence to run everything. Regardless of the defence structure there will always be times wingers are covering at the back. It would be handy if Daugunu had a kicking game to complement his running game. I’d imagine Rennie will want him to have some capability in that area. I’d love to know if his failure to kick for the Reds was due to thought or design.