W,
The 18teens dont hold "international championships"!! Whats they hold is a cup named after a sponsor!!..

So the ISAF has no say in the running of the event..

The Tiapans as far as I know dont host a "world title' or Inernational title".. They do fit I believe under the rules for an Australian Championship and are (as far as Im aware an affiliate of YA).. So who ever sails in the national titles is wihin the ISAF rules..

So as far as I can see your two logic statements are flawed.. (sorry)