An interesting connection between the Korbonos of the Nosi’im & the words of Tefila.
HaLeVei, I’d say that the individual mentioning of the Nosi’im was because every person stands on their own level, their own character, different type of Neshoma, therefore the Korbonos were coming from all different levels, turns out being that they were very colorful. That is the meaning in the Ramba”n. however at the end they were all calculated together since they all happen to be physically the same, they all add up together. Or maybe even better said, since the blend of all those colors bring out the Shlaimus of the Korbonos, therefore they truly do equal up as one.