when there is a correction against BTC, almost all altcoins will also experience a correction and tend to be larger, and that has been the case for years
Yes, majority of the altcoins are also going to have their own corrections following bitcoin with that move. From time to time, that's always the thing about bitcoin and altcoins connection and even with Ethereum, it's also affected by bitcoin whenever the price falls.
Bitcoin will remain the strongest.
That's going to be the case as most of the time, bitcoin will remain to be at the top spot all the time. Despite many have thought and tried to pull it down, no one has ever been lucky and succeeded.