@Vertigo Not true, though there is much speculation about how to break GW nodes, and while it certainly involves crossing a certain power threshold, no one knows for sure how or exactly why.
For example, about 2 months ago mine broke node 12 with no desernable reason why. When Fulcrum was released it unbroke for a couple days, I plugged my top 5 into node 1, had a busted 12th node again, and ever since. Multiple guild mates have tried both arena & GW comps with a higher powered squad then mine, and still have a normal table.