If I had to set up a scenario for a new defender to fail in I'd have a hard time beating:
- replacing the captain and best defender who had gone off injured
- wider team on bad run of form and looking fatigued
- misfiring midfielders and attacking players so less likely to be bailed out of any errors
Sounds like he had a stinker but that doesn't mean he can't contribute going forward.
Flint is injured and won't be contributing for a while. He absolutely cannot play with Morrison but, to be fair, was the better defender of the two when he first arrived. If we need him consider bringing him back for short-term cover.