The Olympic eligibility loophole that allows players to swap nations may be closed to heavier athletes and any others the IRB arbitrarily decide are not genuine candidates to play sevens at Rio.
The game's governing body, conscious they have paved the way for players to once again represent two nations in a career, will use an as-yet unspecified committee to determine who will and won't be allowed to switch allegiance.
This subjective approach is being used amid concerns that sevens events over the next two years could be abused by players who have no real intention or desire to play the abbreviated game. As a result of sevens being in the next Olympics, different eligibility laws will apply.
As the Herald on Sunday reported recently, players whose eligibility has been captured by one nation will be able to represent another if they hold the relevant passport.
All they will have to do is play one sevens tournament in 2015 or 2016 designated as an Olympic qualifying event. If they do that, they will become eligible for that new nation at all levels of the game as long as they haven't played test rugby for their original nation in the past 18 months.