So Aeris is now murdered and Sephiroth has been framed as killer.

Prove that he was framed is that before murder Sephiroth is seen with and without gloves so someone just made sloppy framing video and it is your turn to tell your theory who is real the killer.

I say it is Elena. She has crush for Tseng but she now Tseng likes her but he also seems to like Aeris so she sees it is best to get rid of her. Cloud is her accomplice who gets rid of the body.