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Listen, Phoenix, your attempts to disprove my theory are so weak, and evidence doesn't always have to be realistic. And it's not impossible that someone "found an old 'Phoenix' in the ruins of a museum, repaired it with whatever they had on hand, and started riding it." There could be many justifications. But we need to judge based on these facts:
1) There is evidence.
2) There are facts derived from it.
3) Based on these facts, we can determine the killer's role.
Whether the evidence is logical or not is a secondary concern.