If we look at bend curve history in last 10 years Neilpryde allways made flex/soft masts(race sails).
Do they allways use flex top philosophy or they switch top felx top when Bjorn leave NP?

You can see that severne use very hard top race mast ,obviously hard top is more fits to Bjorn style..

I think all race sails develope around their best rider,so NP last 10years is developed aorund AA ,and his feedback is most important..
Just like reflex was developed around Bjorns requirements..etc