This might be the thing here:
(a) He has not played a match (either in full or in part) in an official competition at °A" international level for his current Association, and at the time of his first full or partial appearance in an international match in an official competition for his current Association, he already had the nationality of the representative team for which he wishes to play.
(b) He is not permitted to play for his new Association in any competition in which he has already played for his previous Association .
If a Player who has been fielded by his Association in an international match in accordance with art . 15 par. 2 permanently loses the nationality of that country without his consent or against his will due to a decision by a government authority, he may request permission to play for another Association whose nationality he already has or has acquired .
Any Player who has the right to change Associations in accordance with par. 1 and 2 above shall submit a written, substantiated request to the FIFA general secretariat. The Players' Status Committee shall decide an the request. The procedure will be in accordance with the Rules Governing the Procedures of the Players' Status Committee and the Dispute Resolution Chamber. Once the player has filed his request, he is not eligible to play for any representative team until his request has been processed .
So that could be how Roux and Smith avoided it. Maybe Wynne never submitted the written request?