to jcarrillovii:
Even if it was true that the advantage for one side might be greater than in traditional chess, this would not be relevant, because the players have not the time to prepare themself for that starting position. It is very important that starting arrays are drawn or published immediately before the playing time starts to run. And because Chess960 understands itself at a superset of classic chess it would be counter productive to exclude this special starting array number 518.