Did Coinbase do an Insider trading? 8,500$ BCH

Coinbase allegedly knew about it and people think that they added Bitcoin cash to their trading system because of it.

The company, which yesterday added Bicash to trading, is under speculation that its employees have used their internal knowledge and bought a lot of BCH at a cheap price.
BCH's price is up to $ 8,500 in Coinbase, while in other sites it is trading at around $ 3500, raising the suspicion of internal trading.
The company's CEO announced that he would launch a comprehensive investigation into the matter and if he found that an employee did trade in BCH shortly before adding the currency, he would not hesitate to fire him.

Unofficial sources reported that the company's CEO went to every room office and threatened the workers with a fork.
A picture of a conversation i saw on twitter and thought about sharing -

What do you think about the whole situation?