Why hasn't my keeper got his 5th star?

[Gwyndster]

You can't add the average for Goalkeeping - 72.6% to the average for Physical - 87% and divide by two.

You would have to add:
The average for Goalkeeping = 72.6%, multiplied by 2 (because it contains twice as many attributes)
The average for physical = 87%
Then divide by three.
Your sum thus reads (72.6% + 72.6% + 87%) /3 = 77.4%

This is less than 80% = No fifth star.

If you would prefer the old system:

The average for Goalkeeping = 153.3, multiplied by 2 (because it contains twice as many attributes)
The average for physical = 156.8
Then divide by three.
Your sum thus reads (153.3 + 153.3 + 156.8) /3 = 154.46 recurring