SWIFT is a communication network, it replaces the letters and couriers ancient banks would have used to agree that payments have been ordered and funds have been moved. Payment don't "go through" any bank that hasn't been explicitly requested. The whole point of the SWIFT network is that it is global and it allows you to reach every branch of every bank.
There are of course banks whose SWIFT processing is handled by someone else, but they are usually service bureaus or central offices within a conglomerate, not partners in a specific country.
