DAX - Calculating weekly average with conditions

[Frasermc98]

I have the following DAX calculation to calculate average weekly total distance for the squad for only players that trained that week (and therefore excluding injured or ill players). I code whether they train or not daily and have used this is the filter expression.

Squad_Avg_Wk_TD 2 = CALCULATE(DIVIDE(SUM(DailyGPS[Total Distance]), DISTINCTCOUNT(DailyGPS[Player Name])), FILTER('Daily TRG Attendance', 'Daily TRG Attendance'[Train (T/F)] = "T"))

As shown in the photo below I also did a similar dax calculation but removed the filter at the end. By adding the filter the total distance is lower. However, when I have calculated this separately, the average total distance should be 35,000 for those that trained as you are no longer including players that have 0 for that week. I am not therefore sure why this difference has occurred and any help on this would be greatly appreciated. 

[lbendlin]

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