Why whale size alone is a weak signal
Account size measures capital, not skill. A large account can be a market maker hedging elsewhere, a treasury managing delta, or a leveraged gambler mid-streak. Copying by size selects for none of the qualities you want.
Worse, whale positions are frequently one leg of a strategy that is not visible on Hyperliquid at all. Mirroring one leg of a hedge leaves you holding directional risk the whale never took.