Exactly the whole crypto market follows bitcoin's price movement, because bitcoin is spare heading the crypto market and whenever there's a bull run like this altcoins always try to pump just like bitcoin, but just as you said only the top altcoins coins always gets all the attention of the investors looking to making profit off the bull market.
It's already on,for about a week plus now, top altcoins have been pumping massively, most of them have even made new highs, so I guess this is the altcoin season we were excepting all this while.