Quote from: cocopopcorn on September 11, 2019, 01:09:22 PM

I think I over complicated my question basically all I want to know is does btc travel directly from Buyer to seller so

seller > escrow > (everythings good) seller > buyer

Or does the actual bitcoin travel through the 3rd part

seller > escrow > (everything good) > seller

Neither.
The correct scenario would be: seller > escrow > buyer

The escrow will release the funds only after the buyer has paid and you as the seller have confirmed the payment.

Quote from: cocopopcorn on September 11, 2019, 01:09:22 PM

If they do take it to their own pile .. isn't this kind of mixing coins since all on going trades will be in one big pot?

Using it as a mixer could theoretically also work. But nobody will be able to assure you that the btc cannot be traced after all.
If you just want to mix btc I would use a mixing service (e.g. chipmixer) or alternatively the Wasabi wallet with coinjoin.