As we all know it when bitcoin price goes down, most of the coins are heading down too. That's because bitcoin it is the Heart of all coins if its sound then all of the coins are good, if it's Bad then all of the coins are going down too. most of the time other coins are following the bitcoin price. just look up the market right now.
What you were saying is mostly true, every coins is following the footstep of bitcoin.
But there is a bad news about it, sometimes the price of the altcoin aren't following the price of bitcoin when it rise. sometimes the price of altcoin isn't following to rise.
I see this market is affected by too many things, not just by Bitcoin. It causes the market and investors to focus too much on Bitcoin every time an event occurs