I don't know much about any of this stuff but my first though was if it is possible to see if the majority of buys at the low price were to one location or wallet (or however that works) or how many automated buys are set for weirdly low values.

You think the person who had those buy orders in just happened to get them fulfilled by coincidence?

Don't you think the most likely explanation is that they were the ones that caused it by purposely margin calling leveraged traders?

If they did they personally lost quite a bit of money in the process. Just the initial sell resulted in a very large number of their coins selling for below the market average (because there's more exchanges than just Coinbase/GDAX). Those ten cent buys won't make up that difference.

How do you know that?

FWIW - I've set ridiculously low buy orders on Bitcoin exchanges and had them filled by flash dumps and I wasn't the one who caused the crash.

Crypto markets are notoriously volatile. This isn't the first nor the last time this will happen.