[lifeisstillgood]

The larger the set the greater likelihood of a coin designed to track joining ?

[qqii]

I'm not sure what your question is. In brief a mixer could works like the following:

Multiple people put money into a pot, in return they get an voucher that anyone can redeem.

At some later point in time someone redeems some money from the pot.

The anonymity set for this mixer is the number of people who put money into the pot. The more people that use this, the more anonymous.