My opinion is that altcoins are still dependent with Bitcoin. We can prove that by looking at the most recent bearish market. Bitcoin's price is also dragging down the altcoin market. Altcoins are still growing and maybe in the near future, there is a huge possibility that they will take control of the market. For now, I can conclude that Bitcoin is still on top.
Yes bitcoin still the number one crypto and I also observed that altcoin is not yet independent because as we can see the market system we can see that altcoin decrease as bitcoin decrease they are all dependent with bitcoin. But no one knows when bitcoin last.