some altcoins price growth are too slow though market and bitcoin is up at the same time, its not easy to those alts to increase their price for a short period of time.. if you get boring on waiting for your alts to rise then why not invest in bitcoin..
In the bull run I am not sure why the people not giving more attention over all the altcoins. If there is more attention over the altcoins we can see the growth ETH and sibling coins.
I see today few coins were falling more in the marketplace. That too waves, REP and ONT are falling in the bull run time. I am not sure how the bitcoin alone moving faster in the price chart.