Commercial banks are 40:1 short the US dollar right now, indicating they are front running lots of dollar decline.  In the past, most bitcoin pumps in relation to fiats occurred with yuan decline and I don't recall any real bitcoin movements based on dollar decline.  It seems like if yuan declines, lots of China money flows into bitcoin, which is then sent out of China and into the dollar or Vancouver housing or something.  If dollar declines, the flow into bitcoin for capital flight does not occur.