Does it really matter that much ?
Coinmarketcap before being acquired by Binance manipulated the marketcap of many coins.
Atleast that isn't happening anymore I guess. Binance is truly a better exchange than the others in my opinion so even if it has listed itself as the number one exchange I wouldn't mind it because it deserves that spot.
right now what you say. decent binance for that place. don't see what the marketcap shows, for every trader will of course know it. binance is a platform with full development. it will be difficult for other exchanges to drop it.