I think its possible of course, its just problem how much money someone needs to have to be able to manipulate with btc, now when btc is so expensive. I also think that something like that happened before to btc, in early days people used this fact to earn.
I see how some people manipulate with cheap alt coins, and from that I make conclusions. Normally btc is so expensive now, and not everyone can do this things with btc. Except the knowledge, someone needs to have huge bankroll and to know exactly what to do with all that money. For sure to have a big team with him, this is not one men operation.