I never saw anything that said they would be handling campaigns "jointly" in either announcement threads I've seen, multiple contact points doesn't mean much.
There is no such "contact method". It is possible that a single project is "split-managed", i.e. that the work is divided (e.g. 1 person does the signature campaign, the other does the bounty campaign). You only get paid for the work that gets passed down to you (as mentioned). This was not the case with Bitblisscoin, as to my knowledge, he was working alone on it[1].
Should that surprise you anymore?
[1] I'm not sure if the new people joined before or after this.