I find the most successful campaigns or brand strategies has the idea owners (usually the strategic, brand or above the line agency) run the idea through the relevant channels. That’s not to say that they need to do everything, more that they need to be hands on where the the rubber hits the road, the point at which the creative concept (the big idea) becomes a tactical execution. It’s in the clients interest to give this responsibility to the lead agency, and hold them accountable for the execution. So many times, the way the “big idea” is executed becomes about cutting corners because of “saving money”, or its “death by a thousand cuts” the slow, slicing and removing of functionality because of a lack of understanding how it is an essential part of the bigger, strategic picture.