I just wrote to you the same thing the parent of your post did. You are missing the part of the scenario where "everyone" except the one player is passive. Both I and the poster broke down the mechanics step by step for you...
You didn't break down anything step by step. If you actually start with an 100% passive market and try having a single active investor in it nothing works. Funds can no longer buy and sell the basket of stocks they need. At that point they'd just trade among themselves and simply not trade with you. To actually be able to trade in the way you describe you'd need a 99.9% passive market where there are still some active traders you are trading with and together you are creating tracking error for the passives siphoning off their gains, which is what I described.
