I don't think CC is working on too many other projects besides Espers right now, but of course we don't know... I think he has been offered money for hiring additional devs several times in the past, but iirc he said that finding suitable devs is not so easy. Unlike other projects which are only about improving the wallet interface, Espers is very low-level and often the development work directly deals with changes to the protocol. Most other devs who would be knowledgeable enough to do this kind of work, already have their own project, just like CryptoCoderz himself. The trailing "Z" was definitely meant to cover multiple blockchain experts to work together, as I am interpreting it.    But right now it's only one of them (yet), plus all the people in the team doing supplemental work like infrastructure, website etc.