Or maybe BTC would have had the full combined price and maybe even more?
I don't think those shitcoins has any effect in bitcoins prize.
I am talking about the time when the fork happened on August 2017. It is a valid theory that BCH "extracted" some value (price wise) from BTC even if that was hard to notice due to the exponentially price increase it was happening.
It was the right time to deploy it; if it was started in a bear market it would be dead and there would be no BSV either.