It seems to me that all theology and most ecclesiology must be built from the ground up. It should be informed by culture and church history, but it should not be formed as defense of particular traditions (or crystalized understandings) or in reaction to other groups. Sadly, the majority seems to be formed in reaction and defense. Take for example current leadership structures in the Churches of Christ. Basically they looked at churches that adhered to the "pastor system" and said "We aren't going to be like that!" In reaction, they went to the opposite extreme thereby creating a system that is abused from the oposite direction. This takes us to a point where even with our "patternist" leanings, we scoff at the Biblical example of the elders being appointed by the evangelist (Timothy) and with the evangelist apparently having at least an equal place at the table with them. We see that as horribly impractical and unrealistic (nevermind that it's Biblical). The theology and ecclesiology of our churches should be built on a search for truth and a search for how to accurately be the body of Christ in the enviornment that surrounds us. Anything else is heresy.