I saw some of her highlights in youtube. she play different position. not sure what will be her position in ageo. I believe each team are allowed to have two foreign players. so, they might have another player aside from Santiago.
It will be difficult for the Japanese players to play in Europe. simply because they have different style of play. the "communication" is a major aspect of that. I remember Saori playing in Vakifbank and Galatasaray. her coach said she didn't do well. not because she is not a great player but because the "type of play in Europe is different compare to asia. we have Zhu & KYK who are both shine in Europe but that is because they are very tall same as European players and had a coaches who trained them very well.
I agree with you. Japanese players are system players and they are only functional in the asian system that's why I don't see any Japanese player that can be useful in a European top team. however, this is not the case for Chinese players since CHN is playing more like a russian style instead of traditional Asian style volleyball. That's why many Chinese players can be good assets to European teams. for instance I would love to see Yuan (MB) in Europe