Erm, what? Spanish/Lusitano horses don't "leg throw", as in do the flick-y thing in the extended movements - if that's what you mean? They tend to be much rounder and higher when moving when compared to many WB's.
I've had to avoid anything to do with her since the Valegro Christmas present thing. All that envy isn't good for me!
Of course there was some lovely riding and partnerships but they were the minority in the warm up. Urgh- what we do to these animals.
Riding schoolmasters is how most young people learn in places like Spain and Portugal, and is why the tradition is so strong there - and why there are so many truly educated riders there.
Surely Iberian horses, especially the PRE have always been used in breeding Central European Warmbloods like the Selle Francais, Danish WB etc. Nothing new here and arabs and TBs have been used to refine some of the Iberian breeds. It's how selective breeding works but perhaps I have misunderstood your post?
Comparing the movement of the traditional PRE or PSL horse with the modern dressage WB is very apples vs oranges though. The PRE is extremely uphill and rounded, with minimal involvement of the back, whilst the WB is extremely long in the stride and very elastic, with hyper freedom of the shoulders and a very active back. There have been many WB X PRE crosses - I have ridden several myself, and they are really not a good mix, being neither one thing or the other. Unfortunately some PRE breeders are busily working to change the traditional type and produce more "dressage" movement, and increasing the size too, neither of which are popular with me. If I wanted to get back into serious dressage competition (I don't!) I would most certainly buy a WB, and leave the Spanish horse to be his glorious self.