If you look at
https://coinmarketcap.com/rankings/exchanges/ you can see a totally different list of exchanges, by volume
1 BKEX $1.853.079.348
2 Binance $1.377.939.113
3 CoinTiger $1.321.659.103
4 MXC $1.318.079.985
5 OKEx $1.303.200.015
I believe those exchanges voluem data are mostly fake and manipulated.... there is no way to determine the real volume of all those exchanges..
Kucoin and Gate.io, from your list, and CoinTiger and MXC from CMC, do not have all that high volume, for sure.
We can't really trust ratings from any of these sites. Way too many unreliable factors, like faked volume, that unless we know exact internals from the exchanges (which will never happen), we will never actually know which exchange is which.
Another good way would be to look at website traffic, but that isn't accurate as well (can be faked, pretty easy).
Recently there's been a lot of new Asian exchanges that are starting to pop up and do IEO's that seem to always profit... Market manipulation possibly? I don't know much about the Asian markets so I can't really make an accurate estimate.