Why is the Zcash to BTC value always relatively stable since its inception, but every other crypto I look up has its gold line (in coinmarketcap.com) wildly swinging all over the place? Also, the market cap is always way higher than the other two lines.
this coin is still getting dumped by the team 
I guess before you wanna say anything and let's take a look at this chart https://bitinfocharts.com/zcash/
You will see how the price of zcash was getting dropped anytime. Stop to see that on CMC and try to watch another relevant site.