No you do not have to win a section to fish the individual match, preference is given to those who have fished a intersite match if over subscribed, this in practice has not happened as there are usually spare places left, your suggestion I am afraid leaves it open to abuse by local ringers, the spirit of the intersite matches is to meet up with those who post on forums, and have the craic, as soon as the matches get the size you are thinking of then it can no longer have that effect, and would take some managing.
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