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Why do you think that? This is pretty common. Often the extended 5. waves comes after 4.wave beeing a handle for a former cup, but here the handle is coming after a full cycle.

I too wish for an extended 5th. They crash pretty hard (Eg: TRON) but that's fine since Dash is way better than Verge anyways.

From what I've read wave 3 can't be the shortest but it can be the longest.