Human beings, obviously.
Ever noticed that some stories have the same characters, themes. Ever read what Chaos says at the end of Final Fantasy? Some sort of time loop.
In this series, the Minbari start blowing humanity away at the Battle of the Line. Then the Minbari surrender.
Valen, their ancient leader, is human, and discovered making a suicide run at the Minbari flagship. Similar plot element to the Battletech novels. Only the Minbari have tractor beams and holographic bridges.
But this story only makes sense, if humanity were once more advanced than the Minbari. That's the Minbari's stake in humanity.