Concernati.
I've not heard from two of my three roommates, and it's concerning me. Not because I care who they are and fi they're compatible, because that doesn't matter. Realistically, we probably won't all get along, but will be forced to under the circumstances.
However, none are talking to each other. We need to get the paperwork signed, and start talking about what we're going to bring, and all that good stuff.
I'm sure it'll pan it out. It always does.