Kudos to you for such a concise summary :thumbsup:
There’s nothing especially “these days” about magazine essay titles with puns in them. Catching a reader’s eye and enticing him to start reading is the title’s primary purpose. This isn’t a newspaper story, where the reader might be trying to get a clear idea of the day’s main events just by skimming the headlines.
Second, this is a batch of documents extracted from one place. It's safe to assume that all they reflect is the views of whoever gathered them. It's the confirmation bias, you know?
The point though is that some of these documents went a very long way to find their burial in the south. Yeah, a sample size of 1 isn't very much to go on (maybe these documents were kept because they were prized possessions of 'foreign' lands?), but it does show in the very least a deep cultural contact between disparate kingdoms in the pre-China age.
Cultural contact - yes, deep - not so convinced. If the said territories would indeed have been in a deep cultural tie they wouldn't had to be united by war. Look at the Romanian unifications:
https://en.wikipedia.org/wiki/United_Principalities
https://en.wikipedia.org/wiki/Union_of_Transylvania_with_Rom...