Originally Posted by
Wolf Kanno
The issue with the "Cloud is just copying Tifa's memories" in terms of why Tifa is relevant, is that Sephiroth pretty much explains this to Cloud to screw with him into thinking he's not real. Yes, it's within Jenova's abilities to copy and alter memories, but the truth is that Cloud doesn't need Tifa's memories to function because we all know he was actually there, and knows details Tifa doesn't know (and even some he shouldn't actually know) about the Nibelheim incident. So I would argue the theory that Tifa was never actually there is still a relevant way of taking out Tifa. Face it, her being there only serves the purpose to make the wham episode even a thing, as she can verify that Zack was doing all the things Cloud was doing. So yeah, you can still kill her off and make the Tifa you see not be Tifa, and not actually create a plot hole because of how many red herrings there are for this whole dumb revelation.