Absolutely! And, in fact, we encourage it! Oftentimes teammates are working on the same project together from start to finish. With that said, the person column on the board should reflect the person in charge of the project in its entirety. Typically, the person column is placed immediately to the right of the pulse name, so that one immediately knows who's working on what project exactly.
Inside the pulse is where you may add more teammates or subscribers working on the project together by clicking - add subscribers inside the pulse and click the + sign.
We do understand, however; that multiple people may be handling separate statuses within one pulse, so here is an example of how it would look: