From a strict portfolio evaluation view,
BankNifty is in a upsurge over the last 2 years and a trending stock always make money. So to strictly evaluate, we need to know the entire portfolio.
Regarding secret methods, I believe that more than the methods big players would be good at execution; they rarely trade against their views which might be a reason for their success. And they have a better setup that could aid them in accomplishing their trades.
BankNifty is in a upsurge over the last 2 years and a trending stock always make money. So to strictly evaluate, we need to know the entire portfolio.
Regarding secret methods, I believe that more than the methods big players would be good at execution; they rarely trade against their views which might be a reason for their success. And they have a better setup that could aid them in accomplishing their trades.