Now think you have 1 btc and you convert it into BCH. Example for 1 BTC you get 10 BCH. Rate per bch is 0.1 BTC .
After some day if Bitcoin grow up, At the same time BCH also will grow up.
If bch rate grow 1.5 btc then you will have 1.5 BTC.
This is possible, but when BCH dumps to zero because it is a scam perpetrated by fraudsters, you would then have zero BTC, zero BCH and zero USD. What then?
What? it is also the same as he said, he mean that don't hold bitcoin but do trading. BTC is like gold that you said that when you hold your gold for a long time, you can't get too much gold but the value was too high in the long period of time and it is like bitcoin, the price was more valuable.