I believe you were wrong. It was a single sell order that caused the crash.
I wrote a bit about it here:
https://steemit.com/ethereum/@ccampbell/my-theory-about-what-happened-on-coinbase-gdax-today
Some people suspect it came from this wallet:
https://etherscan.io/address/0x7d551397f79a2988b064afd0efebee802c7721bc
Yeah I've seen some posts about a whale accidently selling it for a wrong value. Also just talked to someone else about it too! I guess we really won't know until a couple days when it's all straightened out. So far there are so many different rumors and stories with facts and fake facts that it's hard to determine the one true reason.
Definitely going to read your post right now and leave my thoughts.