Meaning that the only logical point of connection between Final Fantasy 6 and Final Fantasy 7 is Dissidia? Or that Dissidia is crucial to the plots/characters of Final Fantasy 6 and/or Final Fantasy 7? I'm not familiar with the fandom(s), but if you can tell me more, I'll try to help.
For now, without more knowledge, I'd say just 6 & 7 would be fine.
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For now, without more knowledge, I'd say just 6 & 7 would be fine.