I have a theory, that some coins influence BTC price negatively,
In the past i felt that once XRP goes BULL, it stops BTC BULL
and now, i see once XRP was dumped after the airdrop, BTC went bull again
Possibly some holders dump their stash of XRP ang goes bullish on Bitcoin, probably they heard some forecast or studied the chart and see that BTC is going to be bullish so they act and sell their XRP with a profit and then buy Bitcoin. Though I believe there is no relation between the two market. Its that some XRP whales are taking advantage of both market.