I don't really know whether sacking the coach will have a significant impact or not for Nottingham Forrest because the performance this season and the previous season also looks the same and there is no difference so indeed sacking the coach now could have an effect or not at all but it is hoped that for Nottingham when they try to overhaul especially for the coaching problem in hope that this will be able to make them better than before at least they want to try to get a little out of the current zone because it is always several levels in the relegation zone which makes them a little troubled by the situation.
Their performance is also actually still too the same and seems normal so I don't understand why they fired the coach quickly in this situation when they could have waited until halfway through the season to give the new coach a break to start with a more optimal approach.