Is it possible that you so invested in pulling a group together that you're overlooking individual talents? Or is it the other way around? A time and management exercise should prove useful since it may be that certain individuals are so focused on design that they are losing track of the necessity to keep to a schedule. You might need to play hard ball and make clear that you need to see adjusted rhythm by next week's New Moon. A further possibility is being asked to explore the idea of moving to another working environment. Unsettling as this might be, it could be that a change of scene would re-invigorate both you and the team you want to pull together.