Tyler O'Neill is STILL ALIVE
The explosion that destroyed Tyler's body made it nearly impossible to identify him via fingerprints or other such methods. By the time his head was found, it was decomposed beyond recognition. These two points could actually turn out to be clues pointing toward the Killer's true identity. The only way to ID Tyler's corpse would be via DNA test. This is where the Killer's Hollywood Hacking skills come into play. What if the Killer hacked into and changed the DNA results and the dental records? What if this was how Audrey's DNA supposedly go onto the inside of the Ghostface mask? What if the corpse that was found in Tyler's car wasn't actually Tyler, but someone else entirely?