Ill think those we called altcoins are now are the tail of bitcoin. As you can see if the bitcoin will going to increase the price and the altcoins also are moving and increase the price to. So the bitcoin was the head to all of altcoins. And that's only my opinion only.
Yes, what you say is true bitcoint can be said by the head or king of all altcoints, and of course altcoint follows the bitcoint movement in terms of increase or decrease in price