1) would've other crypto's survived during that time ?.
There are more than 6000 cryptocurrencies, which one of them means.
Keep in mind that there are thousands of currencies that have died even in the vicinity of crypto days.
2) Why do Bitcoin survive during crypto winter and other crypto's finds it difficult to cope ?.
There is no reason for failure. These currencies are either useless, scam, or have no real use inside and outside the platforms, or there is no development that attracts customers.
The reasons are many, but the result that 99% of these currencies are bad for long-term investments.