I'm pretty sure Prout will be the 7th d-man and spend much of his time in the press box. I have to assume that Gio, Brodie, Hanifin, Hamonic, and Stone are locks to be on the Roster on Oct 4.
Possible defense combinations are:
Giordano - Brodie
Hanifin - Hamonic
Stone - Andersson
Prout
Giordano - Brodie
Hanifin - Hamonic
Valimaki - Stone
If the Flames keep Valimaki up and send down Andersson everyone plays on their accustomed side. However, Andersson deserves to stay up too but since he normally plays the right side there's conflict with Stone who also plays there. In the preseason we didn't see Stone play the left side even once and I doubt they would play an inexperienced Andersson there.
IMO, and a few others opinion too, the easiest thing would be to start the season with 8 d-men and keep both Andersson and Valimaki up (right now they both deserve it) and rotate them in and out of the lineup to start the season (say the first 10 games) to get a better read on both players. However, I've been informed by others that this definitely will not happen (although others have been wrong before).... so we'll see.