the spark of the match was asics. but how big the flame of the 2013 ATH was as you said due to a few speculative factors that over priced it. which is why it corrected dow nonce the flame blew out
the biggest force behind the 2013 bubble was Mt Gox and their fake pump of the bitcoin price with the power that they had at the time thanks to them controlling near 80% of the total market volume.
you got a source for that volume claim?
i really have to disagree with the emphasis on mt gox. huobi and btc-china were huge drivers of the 2013 bubble. i was trading back then and they consistently led the market. i think people focus on mt gox because it was the largest exchange for western traders. it's a very western-centric view.
and the thing about the willy bot---or "tether printing" and other similar manipulation narratives---is that real traders and investors were paying those prices. people like me across the world were trading those order books, not just the willy bot. it may have played some role but it definitely didn't cause the bubble.