Someone else said foreigners are the ones to make that something special, to be the key factor for most teams in most leagues.
I think, first of all, the coaches and managers who hire those players needs to be blamed as well, not only the players.
Osasco fans can tell Sanja and Cate didn't play as good as they thought they should but at the same time let's just realize the world lacks good OHs that are good receivers and spikers. There aren't many of them and Osasco had 2 good ones in Jaqueline and Garay. It was really hard to replace them both and overall Sanja and Cate did the best they could.
Having said that if you look overall at all foreign players who played in Brazil most were just average. Hildebrand was one of the best IMHO but even so she did many mistakes receiving and she was the one people expected most along with Cate. All the other ones are just average receivers at the best (Glass, Herrera, Mihajlovic, Sanja) and they just did what we all know.
I think Brazilian league is even harder for foreigners because most of teams needs good receive in order to develop their games because they don't have players who hit high balls like Gamova, Kim, Glinka, Brakocevic, Montano...
So maybe Amil is looking for a better OH receiver and betting on Saori. I have my doubts. I still remember the Saori player from 2004-2008, many mistakes... Maybe I'm just being unfair to her. Let's just wait and see what will happen next. Jaqueline and Garay should really come back to brazilian league. As for Sesi, good for them. They realize somehow the balance of having good receivers and good spikers and through the game the coach changes in order for what they need.