You have to ask yourself: Is a 14 billion marketcap prone to manipulation? I would say yes, if you believe there are whales big enough for that. Im pretty sure there are very wealthy people out there, but it would take a big group of big whales in order to move the market at will and we would be looking at synchronized action.... very hard to pull. I think its just supply and demand and some manipulation.
I may think if the eth whale who place a buy wall over 2k btc isn't mean something for the price of ETH. It's will need over than a person for controlling 14 billion market capitalization. every whale had a thousand btc in their pouch.