While not wanting to diminish Stevens’s stints at LCB where he started in the Championship, I think people need to remember that this was the Championship, and Stevens was a confident player in form. That’s very different to sticking him, a player going through a rough patch, in a position clearly more difficult than his current one, up against a much better quality of forward.
Let’s also remember that there were errors in his stints at centre-back. Notably vs Bristol City after JOC went off, but he also threw away two points at WBA when misjudging a simple ball forward in the dying minutes (Henderson made a superb block off Montero), and that had come in a game he’d been otherwise excellent in. Robinson gets way way too much grief off folk in my opinion, and the idea that Stevens would just slot in there and make things instantly better doesn’t seem clear to me. If anything he might benefit from some time out of the team.