https://www.cryptozink.io/currencycoin/GXS/gxchain/
Looking at this project that you mentioned, you will see that they have a very active team that are working hard and promoting their project while they also have a working product, so if their coin was not artificially pumped, then I think that their handwork is what must have been paying up for them right now. Altcoin must not depend on bitcoin for them to increase, it is only a lazy altcoin that will always depend on the increase of bitcoin for them to be lifted up. If altcoin manage their project very well, they ought to be completely independent.