As I understand , Halkbank is trying 3-4 different rotations. The players whose position is stable are Kaziyski and Juantorena as OH, Resul Tekeli as MB. The interesting part is libero position. They are letting Can Ayvazoğlu play as libero instead of OH, which is a mistake I think.
Rotations;
1. Setter : Raphael, MB: Sabit Karaağaç, OPP: Emre Batur
Sabit is a terrible blocker .Block will be extremely weak.I don't think they can survive with this rotation.
2. Setter:Raphael, MB:Emre Batur , OPP: Burutay Subaşı
Burutay is a left handed player, can attack very efficiently in OPP position but he is short again block will be weak.
3. Setter: Hüseyin Koç ; MB: Emre Batur , OPP: Mitar Djuric
This one is interesting. Block will be ok but they will lost Raphael.
Since Stoychev is used to play with very stable and talented squad, he doesn't like working on different options. This is why they are trying to sign a strong Turkish MB to make rotation 1 only option.
I think they must try Kaziyski OPP and Burutay as OH but I don't think Stoychev will take any risk.