I think that you'll find that the definition of a spinniker is a sail whos Mid Girth is greater than 75 % of the foot length. Therefore a screecher by definition is not a spin because its MG is less than 75%. A Screecher whos girth is greater than 75% is a code 0 or a spi.

I also think that it is ridiculous to suggest that the screecher was invented in 1993. Sails just like these ones have been around for a lot longer than that.

Some of the Volvo 70 boats claim to have invented a new sail last time round and refered to it as a spinoa. But really its just a screecher with a different name.