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TIDM-1000: What is the reason of IL1_Fdbk and IL2_Fdbk being connected to two daughter card pins?

Part Number: TIDM-1000


Looking into schematic I see that IL1_Fdbk and IL2_Fdbk are being connected to pin 15/pin 20 and pin 21 / pin 27 accordingly. IL3_Fdbk is connected only to pin 25. Is there any specific reason to that? Is this just to be more flexible on pinout usage or maybe some design advantages?