Austin Hair wasn't a Tige rider. Maybe the other manufactures told their guys not to compete. Or maybe since it's not a points event for a title they figured it wasn't worth the risk. I didn't see many other teams pro's even entered like last year.
Someone posted somewhere else on here that there was only 1 non Tige team rider that even entered. So none of the big names listed above even showed. Not sure why. I don't really follow the pro events much though.