My Humble Take ... is a mix of Precalculated and In-match variations. Firstly, we all notice that the GE freezes changes before the start of the match. This is to pre-determine possible (baseline) results based on players, formations and tactics set. Not sure whether it is just me or anyone else also notices that during Gameplay (about 1 or 2 times in each half) - there is sort of a mini freeze to the game (almost as if there is a routine running to assess any changes made to the baseline). Im assuming that such a routine may do a +/_ to the baseline (although not considering ALL detail elements) - but high level changes to players, formation and corresponding tactics. This yeilds the odd goals / saves etc ... when we make in-match changes