The ranking of ADA depends on the calculation of circulating supply. Coinmarketcap does not calculate those 5 billion ADA allocated to three companies but Coingecko does and that's what causes the difference in ranking of ADA" that must be a obvious reason for the difference

I already mentioned that. The confusion arises as there is no info about those premine coins. No one seems to know whether they have been spent or not.

I like both coinmarketcap and coingecko.