So Musa really is the only failure, a player who was raw and had potential to be "the next Vardy", but hasn't been.
Zieler was fine as a backup keeper, but when it was clear Kasper was staying, he wasn't happy to stay, fair enough, and we made a profit selling him IIRC.
Hernandez, again we got a profit from, and did fine in the Champion's League as right back, but was never given a chance at centre back - where he has been playing this season and was playing the season before we signed him.