How can btc be controled by Bitfinex if they only have around 10% of the trade volume and MtGox used to have the vast majority of trade volume in the early days(up to 80%)?
Stop asking the same question over and over. All you have to do is manipulate whatever the market maker exchange is and the others follow. It doesn't matter if Bitfinex has less market share than Gox. If anything that just makes it easier for them to move price since people look to them to determine price in the west regardless. A single entity/person has controlled the price on Bitfinex all the way from $200 to now the vast majority of the time.