i agree it's not just china, but they have had a pretty big role. the start of the chain of events was ulbricht got caught, which dipped the price of BTC by about $20.. then china came into the game and it shot up to the moon. U.S. speculation then took over when the positive senate hearings. to me, there has not been any other meteoric event that has occurred since the senate hearing.
Actually, if you look closely at the charts, at the consolidation point around $200 it was Bitstamp that led the rally (or Gox, its arguable). Thats when China lagged.
I look at the rally being $200. But, yes, you could say it started at or before Ulbricht, too.