I know I’m kinda getting in here late, but seeing as how it got bumped a couple times after an extended period, I’mma take a swing.
If the goal is have-guys-in-the south-to-defend, isn’t a more cost-effective (and by extension more flexible) thing to do just walk the guys down there you wanted to put there anyway?
If you’re making a 12 IPC bet that you’re going to need to place 6 dudes, why not just walk the 6 dudes down there so they’d be there when you’d be buying them anyway… And then you’d still have the 12 IPC. And the same number of dudes covering the south.
And if you don’t use them they can just walk back. If you don’t use your 12 IPC complex, it can’t walk back. And can be used against you or allies (not having to spend on another complex to take Persia IC and/or Cairo for the board victory can make a 1-turn difference or more that we all have experienced can make-or-break a game).