1) would've other crypto's survived during that time ?.
2) Why do Bitcoin survive during crypto winter and other crypto's finds it difficult to cope ?.
Yes, there's a lot pf crypto survived that time but most of them suffer a tremendous loss that is more than the loss on Bitcoin price. I suggest that you shoul use coinmarketcap and check the coin history. Most of the top 100 tokens are the survivors of crypto winter.
2) Why do Bitcoin survive during crypto winter and other crypto's finds it difficult to cope ?.
Because Bitcoin is Bitcoin. It will not die because there is no team behind it that holds the majority of the supply. This is the advantages of Bitcoin among other token. Satoshi is the one true developer that dedicated his life for the sake of his creation. He never touch all his Bitcoin despite the price sky rocket a lot.
You can use Litecoin as an example. Charlee Lee sold all his LTC token during the last bull run and other altcoins team slowly unloading their token that cause the dip on every altcoin.