About Metcalf. Her form is very unstable and Daimi is very good transfer. Additionelly... you didn't think that Daimi can play on OH? With Thai defensors, they can play on 2 people in reception and Daimi can focus on attack. Ramirez is very fast and jump, so she can be good player for Nootsara's style. Definitelly Igtisadchi can be better team with Daimi.
If the transfer had been made earlier, maybe yes. But not a month before the end of the season! Besides, Wilavan is the better receiver of the two Thai OHs, so she should play, and Onuma is very good in attack, so there is also no need to let someone else play.