How can you say that you can tell which meat store it is? We apply Kal Kavua by Teisha Chanuyos. If you can tell which one it is then there is no Shayla about which one you are in, if you can’t tell then according to your reading in Tosafos you go after Rov stores anyhow.
I’m not saying what sam2 said, that people are never Battul just because they are people. The main point is that when it turns into an Iruv then we say Chad Bitrei. It’s pretty self evident that we don’t think of people in a crowd to be just a particle of a mix (even though we often do use such terms), while in terms of the human race it is a unit in which its members are individually indiscernible.
Truthfully, is there no difference in your eyes between a man in a crowd and man in the world, or are you just searching for a good Lomdishe term that can define it?