There is absolutely no Nandi-Kispigis rivarly.
Some Nandis just feel the heat because many Kipsigis moved to Nandi - generally did well - some of have gone for leadership.
The same way Maasai feel the heat in Narok.
But trying to divide Nandi-Kispigis is futile exercises.
Nandi and Kipsigis are very very close.
They were on tribe until 17-18th century. The language is 99.8 percent similar. There are maybe 2 words difference.
Nandi can move to Kispigis and Kipsigis to Nandi without any problem as far as anybody can remember.
It easier to divide Kipsigis with other kalenjin subtribe - but not Nandis.
Other Kalenjin sub-tribe can raid each other - like Tugen versus Pokot - or Pokot versus Marakwet.
But never in history has kipsigis and Nandis raided each other.
Because they cousins.
Kones tried with Moi tugen - with little success.
So it generally hard to seperate Kalenjin.
As for doomed Kipsigis bla de bla by Isaac Ruto and his surrogates - coz of William Ruto.
It fails immediately because William Ruto is a Kispigis.
There is no difference btw William Ruto and Alfred Keter.
Both are Kipsigis who are 5kms apart from their historical grounds in kericho.
One from Kapsoit. One from Kipchimchim.
Ruto father emigrated in 1960s.
Keter father maybe in 1980s.
Both speak Nandi and were born in Nandi.
Someone like billionaire David Langat struggled because he is born in Kipsigis, speak kipsigis and wanted to vie in Nandi.