It would mean that the MU of the 4th unit of A, the 3rd unit of B, 7th unit of C, and 8th unit of D are roughly the same. In other words these units are ranked close together on his preference rank. Close enough together that he does not choose a different configuration.
Pref. Rank
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4th unit of A
3rd unit of B
7th unit of C
8th unit of D
5th unit of A
With the preference rank above, he is unwilling to give up the end attain with the 8th unit of D to get the end attain with the 5th unit of A.
