The winning technique in VI 4v4 high era has already been demonstrated by the Silent Assassins. Due to imbalance in VI, this technique converges to a single method. The replays are available. There is nothing more to be learned about VI 4v4 high era, and I suspect that the same technique works in the other eras as well.
What ever gave you this idea? I the last CWC Silents and RTK tied. It was only through the tie breaking rules that they won. This hardly proves that theirs was the only winning technique. As I was a sort of honorary member of SA and helped them practice and recruit ,this method I think I have some credibility here. It was the same basic thing Surp had used in the Deathby clan. The Silents were good for the same reason every other strong clan was ,good players and practicing together.They practiced their tecnique constantly until it became automatic. When ever we did this we also were almost unbeatable. Its not easy though to find players with the time and dedication to achieve this.SA was a sort of super clan yet we still fought them almost to a standstill. It could easily have gone either way.