maybe not btc and eth , but bch was 650$ the date of the fork and it dropped to 200$ because of bsv
High cap alts normally all fall together as people lose hope that have more power to start buying back bitcoin...
But bsv would've caused bch to drop as I said...
There was less hype on bch too and a greater amount of bad rep on one of its main sponsors and also they called standard bitcoin bitcoin core...
Did bch start to be valued at 0.15 too or was it 0.015 (from the start) I think it dropped a lot of its the first or remained stable if it was the second (it's been so long ago since I claimed my forks)...