I think that I can address part of your question, Tesla.
Especially after the second viewing, I'm completely confident that the Cylon Colony was knocked out of its "locked in" geosynchronous orbit by the Raptor's nukes, and it was last seen tumbling down towards the black hole. At that point, it was absolutely imperative for the Galactica to jump, lest it get caught in its own event horizon and suffer the fate of the Cylon Colony.
Other basestars teeming with Cavils and his ilk may be out there, but there was no hint or mention of them, so, who knows? I didn't see any basestars there, and I doubt that they were parked on the backside of the base, where its even closer to the black hole's event horizon. The only point that's immediately relevant is that those who could've had a direct impact on the fate of all who the Galactica guarded were present.
Upon some reflection, I think that it might even be somewhat safe to say that "The" Cavil knew precisely where the fleet was, and if he had wanted them destroyed it would've been a matter of just giving the order--
so why didn't he? Egotism? Sadism (he wanted them to suffer more)? Incapability (Hera, stretched too thin)? A combination of all three reasons?
The incapability portion is what I'd like to think the Dispora team could really run with. While I'm all for virtually recreating events from the established Galactica history, I strongly feel that there's a lot of room for following other (smaller) bands of Colonial survivors. The reason why we didn't see any basestars at the Colony could be a or "the" major highlight of a campaign that's never covered within Galactica's arc, yet nevertheless has enormous consequences of what's seen on the show.
I desperately hope that the Diaspora team is ambitious enough to cover both what's seen in the series, and what's not. In all honesty, I'm more interested in exploring what's not known, rather than what is.
