Arina, Markova, Kunzler or Anthi reached to great attacker performance but cannot be considered as being fully skilled and great performer in all mentioned areas. So yes, they are just great attackers.
By referring to current stats, Wilhite, Gabi and İlkin can be considered as strong OH's, In addition, Meliha, Tuğba, Hande and Dimitrova are also pushing this class.
Kunzler is NOT a great attacker at all. No player who finished half of the season with 33% attack ratio could be called great attacker same with dimitrova. With such a terrible killing ratio, she is not pushing 'strong OH class's 🙄