No, DPC is doing just fine on their own. Working with a team would more likely increase rather than decrease time, especially if it's a distance working relationship where DPC has to communicate to them what they want. They'd waste valuable time instructing people how they want the characters to look, the pose to put them in, the camera angle, etc, and if DPC isn't happy with the results, they then have to spend time changing it. There's also the fact that other people aren't guaranteed to have machines as powerful as what DPC has so their rendering time might in all likelihood be slower.
I get the desire to want to see updates produced faster, not just for this game but for others as well, but DPC is producing thousands of renders in the same space of time it takes most other devs to produce a couple hundred, so I'd say they're doing just fine by themselves.