I don't know if it has been brought up here, but jbg suggested that perhaps the team form a "council" and we can apply the wallet donations to a multi-sig wallet controlled by the council.  We are the process of forming this Council at the moment.  That way a few of the community members will be in control of the funds and their release to him.  He proposed that if we are not content with the work that he is doing then we could opt to dismiss him and use the funds to hire a new developer.  The team will keep you updated on this and any other advancements that we make in the process of alleviating the existing uncertainty.  Again, thank you for your concern.  You've provided the less tech savvy of us with a necessary direction in this area.