Yes, this is right, but it appears that the value of the original coin and the forked coin don't correlate with one another too strongly after the fork. I mean

Yes, this is right, but it appears that the value of the original coin and the forked coin don't correlate with one another too strongly after the fork. I mean here that it appears that the market value of BTC will not be reduced by the market value of GCC, in such a manner as you suggest. The less popular coin after the fork certainly is less valuable, but after the fork, the two values follow their own destinies, unrelated to one another.