Whose to say that someone with deep pockets couldn't go out and go buy about 5 spinnakers and pick the best one for the event?
It's all ready been done in the Nacra 20 class. The consistency is far enough off that, that was a standard practice among the well sponsored teams in the Worrell and to a lesser extent the Tybee.
Beat me to it! In our experience the sails (not just the spins) have been so different that calling it OD is pretty iffy.