It has been recorded for quite a time when there is a huge depression in crypto price, there is a general increase in dominance of bitcoin.
If you view the price of others coin as well, you can see they've relatively decreased with respect to bitcoin.
And similar is the case for increase. Altcoins increases at a greater rate than bitcoin.
Yes altcoin grow in greater rate or percentage compare with bitcoin but not all of them.
Only the altcoin which has great value of idea and good team can grow so much in value. Shitcoin would die.