Yes sorry but for me not big difference (It is not because I trust Duygu or İpek so much, reason is probably Selime or Seray doesnot have same meaning as you have )
if your arrivals are playing in the same conditions and still play well even in the case of injuries, it is not fair to blame federation. And having a good spiker as a bench player does not mean use them lik how Galatasaray used Seray For example Vakıfbank using Güldeniz in a very efficient way in my opinion.
All in all, from my perspective it was soo obvious that they would have a big trouble in the case of Seda's injury, so it is a huge mistake to only trust Yağmur and hope no injury for seda (indeed she is known with her frequent injuries )