I read that wrong. Colback wasn't keeping Hayden out of the team though, they were rotating but Hayden started the 4-5 games before Shelvey's ban. Not sure when Colback was injured?
EDIT: Colback's started 11 games. Hayden's started 19. They were rotating.
When we went on that winning run, Colback was starting ahead of Hayden
Why do you think Colback wasn't even on the bench? He was injured for around 5 games before Shelvey's ban
As soon as Shelvey got banned Colback was forced to come back into the side (and so I'm told) early