We've agreed we disagree on this, but that's fine.
I think the players we've truly missed this season are Jorge Grant and Ryan Yates. We became a lesser team when Yates left last Christmas, and this season we're without the goals of Jorge Grant as well, effectively back to being the failing team we were before both of them arrived.
When Adam Collin got injured in October 2017, Fitzsimons took over for around three months when Yates and Grant were also in the team, during which time we only lost two games. The decline in form over the second half of the season corresponded with the departure of Yates. Adam Collin was back in the side by the end of January but didn't affect the drop-off in results.