That's the usual trend mate. Bitcoin has been the biggest market controller, by far, compared to other coins and also other market movers like the community, trends and latest news pertaining to cryptocurrencies. Bitcoin has had that capacity because of its characteristics being the pioneer coin with the biggest value amongst all other coins. It also is the single-most recognized coin by many of the cryptocurrency users seasons and beginners alike. Having so many things going for it has really made it the best entity that either draws the market up or pulls it down, depending on how it's moving in itself.