Bitcoin and gold to deference currency. I think don't have any connection in there. If you follow bitcoin price chart you saw that bitcoin price all time increase and decrease but gold price can not increase and decrease in same way.
So i think don't have any relationship between Gold and bitcoin.
I disagree with you, all cryptocurrency is related to each other but the bitcoin is most demand crypto. There are several crypto currency that can be use to exchange in local currency, my point is the other crypto like gold need to trade on other currency like bitcoin before local currency that will become fiat. Indeed, if they trade both, the stock of bitcoin will decrease and the value will increase and the stock of gold will increase so the value will decrease.