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
Did you check the price of alt coins before the bitcoin rally, if so you will understand that some will dump the alts if there is a huge surge in price in bitcoin to ride the rally and make the profit possible by dumping all their alts and once the price of bitcoin faces a corrections they will invest back in alts and during that period we might even see a rally in the altcoin market.