Regarding Goalkeeper form, I think it has to do with the number of goals they concede and how many saves they have versus the number of opposition shots on target, and the rating in one match is no indication of how they are going to perform in the following match.
I'd already started the following comparison, as it is the first time I've had similar quality 'keepers - usually I have a high-Q one for general use and a lower-Q one for occasional appearances and injury cover.
Here are the two 'keepers concerned - Carroll was ahead in Quality 93%-91% at the start of the season.
From a little bit of experimentation last season, McKibben (bought off the regular Transfer Market) is better in League matches and Carroll (bought from the Scout list) in CL and Cup matches, but I will swap them occasionally (sometimes unintentionally).
This season's performances - the higher number of saves vs opposition shots, the better the rating. If they concede then the rating goes down (usually by about a point a goal conceded).
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