Edit: Put more simply if one fund owned 99% of every stock it would not buy or sell in response to price changes. So, if an active trader wants to buy or sell they would need to find another active trader to act as a counter party. This would then move the stock price.

My point about ownership percentage was simply that passive traders and active traders only interact when the total amount of stock changes. But, passive traders are simply speeking a fixed ownership percentage which means they don't change the final price only the active traders who must end up with that same 1% based on price movements.