Mm depends on the story really. By including a paradox in the story, it would not aid the story in any way in its current form. Maybe in a potential sequel of some sorts. The closest you will come to a paradox in this story is that the characters are retrieving the Kusanagi, which while listed as a lost treasure by many resources, is claimed to still exist and be in the possession of the Japanese government. In fact, it was even seen in like 1993 I think? But some suspect that was a replica. Either way, possible paradox?