I agree with this. You add depth to the organization by having young players (exempt from waivers) developing down on the farm.
So do I. But, with the current roster we'll have Ristolainen, Bogosian, Pysyk, Weber, Gorges, Colaiacovo, Donovan, Sanguinetti, McCabe and Ruhwedel. Add Franson to that and that's twelve defensemen of which five would go to Rochester assuming we want seven D-men with the Sabres. If we want depth, we don't want to demote someone who risks getting claimed off waivers.
I think the first six names are a lock, and I would assume Donovan and McCabe fight it out for the seventh spot. However, if Franson is in the mix that would pretty much lock seven players and demote both Donovan and McCabe, and that exposes Donovan to waivers (right?).
I'm not sure where I'm going with this other than control of your players is a factor. And that's why I believe McCabe starts in Rochester. It's not enough for him to be slightly better than a player that has to pass through waivers, he's going to have to be better by a margin.
But then again, Donovan or Cola may not be especially hot on the market and therefor possible to sneak through waivers.